Definition: to smile a big smile Level: C2
孩子收到礼物后对她妈妈咧嘴笑了。
The child ___grinned at her mother after receiving a gift.
他在讲笑话前顽皮地咧嘴笑了。
He ___grinned mischievously before telling the joke.
当他获奖时，他忍不住咧开嘴笑了。
He couldn't help but ___grin from ear to ear when he won the prize.
