He stumbles around and his style is clumsy.
他走得蹒跚，姿势拙劣。
It is when he walks by night that he stumbles, for he has no light.
若在黑夜走路、就必跌倒、因为他没有光。
He eventually "stumbles upon" the right answer.
他最终“发现”了正确的答案。
He read well, with only a few small stumbles.
他读得很好，只是有一些小小的错误。
He read well, with only a few small stumbles.
他读得很好，只是有一些小小的错误。
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