名词
中文翻译：线下垂
同义词：
['sagging', 'sag', 'line sag']
例句：
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1. The old building's foundation was showing signs of sag.
这座老建筑的基础出现了下垂的迹象。
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2. The car's suspension system had a sag in the middle.
汽车的悬挂系统中间部分有下垂。
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3. The weight of the snow caused the trees to sag over time.
雪的重量使树木随着时间的推移而下垂。