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Children's Popular Science Story: Bellflower and July Traveler
"The big bellflower behind the big stone is in bloom!" The deer barked and jumped over the stream and ran to the valley on the other side of the forest. The wind was blowing slightly from there, and large tracts of platycodon grandiflorum, hyacinthus orientalis and passion fruit beside the stream shook their leaves in the wind and could not stand straight.

"Campanula blooms! Flowering! " Such a happy cry is blown in all directions by the wind, echoing between every flower and every leaf.

Bundles of white flowers, picked by thin grass stems, also swayed gently in the wind, leaving a large area in the open space behind the big stone. The whole corolla is like a wide hat, divided into five petals around it, and the pale yellow stamens protrude from the stamens and swing with the stamens. "So, the campanula blooms like this." The squirrel put his hand around the campanula, looked at this one and another, and stood on tiptoe to smell it. It was a faint fragrance. "This is the first time I have seen such beautiful flowers." Little Nutbrown hare replied, "It's a pity that these flowers don't ring when the wind blows." It's really hard to imagine, what kind of musical instrument is the wind chime that the traveler said? You can hang it on the window, and it will tinkle with the wind ... "Recalling the traveler, the squirrel and the rabbit couldn't help laughing. It was a brave traveler who walked a long way and met so many interesting people and stories along the way, even if there were difficulties and setbacks. He is going from North America (what kind of place is that? ) Go to the foot of the Alps. They spent the whole summer together last year. What a wonderful memory.

In fact, there are no bluebells in this forest. Last year, probably just after spring, after a heavy rain, there was a traveler-the kind of person who walked from one place to another and traveled around the world with a small bag on his back. He was washed away by the river in the distance, sleepy, hungry and injured. -fell at the door of the little rabbit.

Barney took care of him all summer. The traveler said that he came from as far away as North America. What a distant place this is. He walked from summer to winter, then from winter to summer, climbed mountains, crossed rivers and forests, and drifted at sea for a long time before he came here.

"It started in July." He said, so he called himself a July traveler.

Throughout the summer, travelers became good friends with squirrels, rabbits and everyone in the forest. He told them many interesting things he met during his trip.

At the end of summer, the traveler recovered, and he picked up his small luggage to say goodbye to them-his trip had been delayed for too long. Reluctantly, the traveler went on his way. Before leaving, the traveler took out a handful of seeds from his bag. He said, this is campanula, a common small flower in their hometown. If you plant it now, it will produce a string of flowers like campanula in spring.

"What is a flower like a wind chime?" At this time, the squirrel and the rabbit asked.

The traveler scratched his head, a little embarrassed, and gestured and said, "... that's a flower like a wind chime." Wind chimes are musical instruments that can be hung under windows or eaves. When the wind blows, they can be very light and make a tinkling sound! "

But squirrels and rabbits still can't imagine. Now, they finally understand: what a beautiful musical instrument wind chimes are!

"Do you remember those instruments that travelers said at that time? In addition to wind chimes, there are drums and xylophones. " Little rabbit asked softly, for fear of disturbing the silence of this flower. "Yes, yes, I know that drums and xylophones are percussion instruments. However, although they are all percussion instruments, they are different. " After the squirrel met Okarina, he learned a lot about musical instruments. "Not the same? Don't you have to knock with a mallet to make a sound? " Little Nutbrown hare asked strangely.

"Although they are all hammered with mallets, the way of pronunciation is different. The surface of the drum is covered with a film, and the inside is empty. It is called a membrane musical instrument because it needs to be tapped on the surface membrane to pronounce. The xylophone is made up of long boards and short boards. Sounds like a board that hits directly. It belongs to a somatosensory instrument. " The squirrel explained. "The membrane on the surface of the drum? You mean drum skin? I know that some drums have only one face and some have both sides. Some drums can be played by hand, and some with drumsticks! " The little rabbit replied, in fact, the little rabbit knows some music.

"You're right, because the whole surface of the drum vibrates and makes sound, so the strength of beating the drum, the hardness of the drumstick and the contact area between the drumstick and the drum surface, including the size of the drum body, will affect the timbre of the drum." Squirrels continue to supplement.

"So what's with this singing instrument?" The little rabbit stuck his head into the campanula and got pollen all over his nose. He shrugged his nose and continued to ask. "Can you guess what kind of musical instrument wind chimes are?" Before the squirrel can speak. Okarina asked a question first. He has been sitting on the squirrel's shoulder since just now. "Wind chimes, wind chimes are wind instruments!" A gust of wind blew, and the wind chimes bent down again. The little rabbit was a little distracted and skipped in the flowers of the wind chimes. "Not only are you wrong, but you have trampled all the leaves!" Okarina protested with squirrels. Squirrel carefully straightened some grass stems bent by the little rabbit and said, "These are precious gifts left by that traveler. How can you step on them? " ""I'm sorry ... "Little Nutbrown hare lowered his head." Then tell me what is a body-singing instrument and what is a wind chime? "

"Actually, wind chimes are also a human body singing instrument." Okarina clapped her hands and did a little magic, so that a string of hyacinthus orientalis could make a sound. The wind blows, ding-dong, ding-dong, the stamens knock on the petals, the flowers collide with each other and spread in all directions in waves.

"It's really good, so this is the wind chimes! Like a clear mountain spring! " Squirrels close their eyes.

"Close your eyes, as if you can fly with the wind!" The little rabbit opened its arms.

Ding-Ding Dong-Dong, Ding-Dong, Ding-Dong, accompanied by the sound of wind chimes, Okarina said: "According to the different ways of striking, body-sounding instruments can be divided into knocking, mutual striking, falling striking and shaking striking. Wind chimes are like this. Even if they collide, they collide and make a sound. The xylophone mentioned just now, that is, the percussion singing instrument, is played by a mallet. "

"Musical instruments can be divided into four types. Besides membrane instruments and body instruments, there are also instruments produced by airflow vibration, but they are not called wind instruments, but air instruments. Wind instruments belong to this category. There is also a musical instrument that is played by the vibration of strings, that is, stringed instruments. " The squirrel finally added.

"Well, I see. How nice the sound of this wind chime is! I really want to plant one in the window so that I can hear it every day when it is windy! " The little rabbit replied. "Yes, I really want to thank the travelers!" The squirrel looked up at the shadows of clouds and trees on the distant horizon. "I wonder where the traveler is now? I wonder if he will remember us? " Little rabbit shook a campanula gently and said slowly, "Anyway, when he returns to his hometown and sees a large area of campanula here, he will definitely recognize us."

Bellflower swaying gently in the wind, the tinkling sound seems to tell the story of friendship and gratitude.