You can write about the back door, the gap between people and so on.
Example: doors and walls
Pessimists say: There are countless walls in this world. Optimists say: There are countless doors in this world. Realists say: the world is made up of countless walls and communication doors.
Life is like a house, everyone has his own space. In order to prevent outsiders from invading, God built countless walls around us. But life tells us that in order to make the room brighter and the air cleaner, we need to open the door.
"I still miss Xiang Yu and refuse to cross Jiangdong." Life and death, what a thick wall this is! However, if Xiang Yu knows how to bear the burden of humiliation and can make a comeback, what a bright door before him! It's a pity that he fell at the foot of the wall and forgot to stand like amnesia. Without photosynthesis, plants will die, not to mention such heroes.
When Sima Qian was punished for defending Li Ling, they were not crushed by this big wall, but stood up more firmly, shoveled open the wall and opened a more spacious and bright door, so they saw Ma Pingchuan at the moment.
Doors and walls are both real and virtual. We are not Erlang gods, we are naked eyes, you know, seeing is not necessarily believing, and practicing makes true knowledge. Sometimes, the wall in front of us is illusory. It may just be the hurdle that Liu Xiang crossed, and it will fall when pushed; Maybe it's just a sub-meter high threshold, you can cross it forward; Maybe it is a wall of imagination when thinking is confused. Why are you afraid of it? ! So to judge whether it is a real stone wall, we must try bravely. Even if it is true, it must be hit with a sledgehammer.
Academician Huang Boyun of Central South University and his team spent 20 years studying the materials for manufacturing brake pads. In the past twenty years, he and his researchers have experienced many failures and encountered high mountains and high walls across the road to success, but they never gave up easily. He hasn't even been home during the Spring Festival in the last six years. Their efforts were not in vain, the brake pad material was successfully developed, and the big wall finally became the door to success. Never give up, only in this way can we push down the unusually thick wall.
In the process of our study, it is inevitable that a hard and solid wall will hinder our progress and deprive us of confidence. Remember, don't give up easily, because the wall is left unlocked.