动词短语
中文翻译：倒塌
同义词：
['collapse', 'fall down']
例句：
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1.The old building was a tumbling-down ruin after the storm.
暴风雨过后，那座老建筑变成了一片废墟。
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2. The roof of the house collapsed due to the heavy snowfall.
由于大雪，房子的屋顶坍塌了。
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3.The old bridge was tumbling-down when it was hit by a flood.
洪水袭击时，这座古老的桥梁已经摇摇欲坠。