名词
中文翻译：主弹簧
同义词：
['primary spring', 'primary mechanism例句：1. The mainspring of the clock is responsible for the movement of the hands.（钟表的主要弹簧负责指针的运动。）']
例句：
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1. The mainspring of the clock is responsible for the movement of the hands.
钟表的主要弹簧负责指针的运动。
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2.The mainspring of the car engine is vital to its operation.
汽车发动机的主要弹簧对其运行至关重要。
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3. The mainspring was replaced after a few months of use.
使用几个月后更换了主要弹簧。