Perhaps, everyone is eager to have a pair of wings. When we were young, we were eager to have a pair of "independent" wings and get rid of the meticulous care of our parents. When we grow up, we are eager to have a pair of "dream-chasing" wings and reach the place we are fighting for; In times of suffering, we are eager to have a pair of "beyond" wings, which can help us fly over despair and see hope; When we are bound, we are eager to have a pair of "free" wings and reach a world where our hearts can soar. ...

In fact, everyone has a pair of wings, which are the wings of family, friendship and faith. ...

Of course, the influence of literature, the infection of music and the power of thinking will also give you magical wings and take you to fly freely.

Wings, organs used by animals such as birds and insects to fly.

Birds' wings are the basic structure of flight. The wings are covered with hard feathers, which are suitable for flying. The shape of wings is determined by feathers, which enable birds to fly. When feathers fly downward, the air under their wings forms a driving force, which is called resistance. Moreover, due to the different sizes of flying feathers, the resistance on both sides of the feathers is also different.

Birds' wings can be divided into four types. Birds with high take-off speed have half-moon wings, such as pheasants and woodpeckers, which are used to moving in narrow flight spaces. These birds still have some small spaces between their feathers, which enables them to lose weight and move quickly. But these wings are not suitable for long-term flight.

The wings of brown swift, swift and raptor are longer, narrower and sharper, and there is no gap between feathers. The "thick" wings will turn back, similar to the wings of an airplane, and can fly at high speed.

The other two kinds of wings are "gliding" wings and "ascending" wings, which are similar in appearance and different in function. Gliding wings are represented by seabirds, such as seagulls, with long, narrow and flat wings and no gaps between feathers. When gliding, birds don't flap their wings, but slide with the airflow to rest their wings. When gliding, birds will fall lower and lower until they have to start flapping their wings and stay in the air. At other times, paragliders fly high in the hot air for hours.

The rising wing structure is represented by eagle, crane and vulture. Different from the gliding wing, there is a wider space between the feathers of the rising wing, which can produce the change of airflow; Wider feathers enable birds to carry prey. In addition, these feathers also help to increase the airflow speed on the upper side of the wings. When a bird rolls up the tip of its feather, it can increase its flying strength without flapping its wings. In this way, birds can easily use the surrounding airflow to rise. Ascending birds also have wider flight feathers, which can greatly increase the wing area and make it easier to fly on hot air.

When ascending and gliding, birds will make full use of the rising hot air to ascend. These air currents let birds "stay" on the rising air column. Many birds have found this rising hot air flow and used it to maintain extraordinary upward movement. Many birds stay on the ground from 9: 00 am to 10 am, waiting for this rising hot air stream to appear.