I heard that birds will grow old, and every time the old feathers cannot fall out, they will not be able to fly freely. Some birds will pluck all their feathers by themselves and wait for new feathers to grow back. During this period, they will be unable to fly and have nothing to eat, which is very painful. I am always waiting, waiting for the feathers to grow back. After waiting for many years, I also want to know what it feels like to be waited for...