名词
中文翻译：弹簧下垂
同义词：
['spring deflection', 'spring back']
例句：
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1.The car's suspension system has a spring sag that causes the driver to feel unstable on bumpy roads.
汽车的悬挂系统有一个弹簧下垂现象，这使司机在颠簸的道路上感到不稳定。
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2.The old house had a lot of spring sag in its wooden floors, making it difficult for people to walk on them.
旧房子的木质地板上有很多弹簧下垂，这使得人们很难在上面行走。
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3. After the earthquake, the buildings had spring sags in their foundations, which made them unsafe to live in.
地震后，这些建筑物的地基出现了弹簧下垂，使得它们不再安全居住。