动词
中文翻译：露出牙齿
同义词：
['smile', 'grin', 'chuckle']
例句：
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1. She couldn't help but smile at the sight of her son's graduation.
她看到儿子毕业时忍不住笑了。
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2. The children were giggling with delight as they played in the park.
孩子们在公园里玩耍时笑得很开心。
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3. He chuckled to himself as he thought about his failed experiment.
他对自己失败的实验想笑。