据说“世故”的定义是“闭着嘴打哈欠”。这解释挺魔鬼的，所以我一下就记住了。只是那时我还小，很求甚解，为了领会这个词，常常试着在打哈欠时，尽量往齿不外露上努力，当然，后来我放弃了这努力，因为打哈欠实在是一件虽不雅，却让人舒畅痛快的活动，而这活动的基本动... It is said that “sophistication” is defined as “yawning in silence.” This explains very demon, so I’ll remember. Just then I was still young, I begged to understand, in order to understand the word, often trying to yawn, trying not to tooth to work hard, of course, then I gave up this effort, because it is a yawn though Indecent, but people happy and happy activities, and the basic activities of this activity ...