If I have never seen Sun's poetry appreciation.

This poem inherits Dickinson's concise poetic style, with four lines and two sentences, which means endless meanings. When you have had a happy experience, any pain will become particularly obvious and intense. Why are people numb? Because they live in a single emotion from birth to death, they are content with this life without any ups and downs, just like the life arranged in Brave New World. But once someone's feelings are touched, he realizes something different and unprecedented, and he can't stand the inherent "darkness" anymore.