玛丽难为情地冲她咧嘴一笑。

Mary gave her a sheepish grin.

《牛津词典》

他对她咧嘴一笑，表示遗憾。

He grinned at her ruefully.

《柯林斯英汉双解大词典》

她认为她那两岁的儿子沾沾自喜、洋洋得意的咧嘴一笑，足以把她推向崩溃的边缘，但她仍然保持镇定。

She thought his smug two-year-old grin of self-amusement and satisfaction would drive her to the brink, but she maintained her composure.

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