他们内心欢心的时候，还会不由自主地扬起嘴角，露出小小的、钝钝的牙齿，他们管这叫叫“微笑”。
They also can't help but spread their mouth and show their little blunt teeth when they like something, which is called "smiling. ""
他嘴角露出一丝微笑。
当她一见到我们时，原本紧皱的眉头一下子舒展开了，嘴角也露出了开心的微笑。
When she saw us, originally the frown at a stretch, the corners of the mouth also exposed a happy smile.
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