动词
中文翻译：突然跌倒
同义词：
['falter', 'stagger', 'stumble', 'lurch', 'stumble']
例句：
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1. The oldman suddenly lurched to the side and fell over.
老人突然蹒跚着向一边倒去。
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2. She stumbled over the uneven ground and almost fell.
她绊倒在不平的地面上，差点摔倒。
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3.He stumbled over his words and couldn't continue speaking.
他结巴起来，无法继续说话。