The primary rules of obligation are those that require or forbid certain actions.
我不知道。有时候当我感觉快哭出来的时候,往往会演变成一种几乎想笑的冲动。那一定是我当时的真实感受,因为我笑了,几乎咯咯咯地笑了。
"A great story is one that lingers in the mind long after the last page is turned."