名词短语
中文翻译：主滑轮用于二级变速
同义词：
['main pulley', 'primary pulley', 'secondary pulley例句：1. The main pulley is responsible for transmitting the force from the motor to the wheels.（主滑轮负责将电机的力传递到车轮上。）2. The secondary pulley is used to adjust the speed of the belt drive system.（次级滑轮用于调整皮带驱动系统的转速。）3. In a bicycle', 'the main pulley is located at the top of the frame and controls the tension of the chain.（在自行车中，主滑轮位于车架顶部，控制链条的张力。）']
例句：
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1. The main pulley is responsible for transmitting the force from the motor to the wheels.
主滑轮负责将电机的力传递到车轮上。
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2. The secondary pulley is used to adjust the speed of the belt drive system.
次级滑轮用于调整皮带驱动系统的转速。
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3. In a bicycle, the main pulley is located at the top of the frame and controls the tension of the chain.
在自行车中，主滑轮位于车架顶部，控制链条的张力。