"I've often seen a cat without a grin," thought Alice; "but a grin without a cat!"

“我常常看到没有笑脸的猫，”爱丽丝想。“但却没见过只有笑脸没有身体的猫！”

youdao

He said nothing but gave me a sly grin that made me feel terribly uneasy.

他什么也没说，只朝我狡黠地咧嘴一笑，令我感到极为不安。

《柯林斯英汉双解大词典》

"Yes, but can your fiancé do this?" he said, executing a perfect back somersault and landing on his feet with a grin.

“是的，但你的未婚夫能像我这样吗？”说完，他做了一个完美的后空翻，稳稳的站住了，一脸坏笑。

youdao

Both sisters had a prim, close-lipped smile, genuine but guarded, as if a full-on grin risked conveying complexities best left unmined.

NPR: Elevating the World's Oldest Profession in Chicago

Ben Stone (Seth Rogen) is a feckless oaf with a wide grin, a bong, and four lazy housemates who are too old to be boys but will never, unless fate takes a hand, bother to grow into men.

NEWYORKER: Knocked Up

Dylan read off the names and said with a grin that he'd be busy that night but otherwise he'd like to be there.

NPR: Dylan, the Red Dog and the Real Summer of Love