动词
中文翻译：Unknown
同义词：
['collapse', 'topple', 'fall']
例句：
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1. The old building was tumblingdown due to the heavy rain.
由于大雨，这座旧建筑正在倒塌。
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2. The earthquake causeda tumbling of the buildings.
地震导致建筑物倒塌。
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3. The company's financial situation wastumbling after the scandal.
公司因丑闻而财务状况急剧恶化。