He had a grin on his face like a Cheshire Cat.

他咧嘴一笑像只柴郡猫。

《柯林斯英汉双解大词典》

With her Cheshire cat look, Saraswati used an app to edit her eyes and an impressive amount of make up and face paint to complete the rest of the look, including the cat's signature toothy grin.

柴郡猫的猫咪形象装扮好后，萨拉瓦蒂用应用编辑了眼睛， 脸部施以重彩浓墨，完成剩余包括猫咪露齿而笑在内的妆容。

youdao

I like laughing while praised by teacher, teased by schoolmate, so much as criticized, I also grin like a Cheshire cat.

我还是个爱笑的女孩，得到老师表扬了笑；被同学欺负了笑；甚至挨了批评还是一副笑嘻嘻的表情。

youdao

He is the Cheshire cat whose grin never fades, a brilliant televisual politician whose ready wit unerringly turns his opponents' strength against them.

ECONOMIST: Bagehot