他笑得合不拢嘴。
当小男孩的母亲给他苹果时，他笑得合不拢嘴。
The boy grinned from ear to ear when his mother gave him the apple.
尽管没有击中的安打飞向他那个方向，但只是上场比赛就使他明显地十分兴奋，当我在看台上向他挥手致意时，他笑得合不拢嘴。
Even though no hits came his way, he was obviously ecstatic just to be in the game and on the field, grinning from ear to ear as I waved to him from the stands.
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