以为了让自己的牙齿尽可能地长长而努力是值得的。
It is worthwhile making an effort to keep your own teeth as long as possible.
以为了让自己的牙齿尽可能地长长而努力是值得的。
It is worthwhile making an effort to keep you own teeth as long as possible.
正如查尔斯达尔文在19世纪指出的那样，怀有敌意地露出牙齿可能是人们表现愤怒情绪的通用表情。
Baring the teeth in a hostile way, as noted by Charles Darwin in the nineteenth century, may be a universal sign of anger.
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