名词
中文翻译：起重机的杠杆
同义词：
['crane lever', 'crane leverage', 'crane lever arm']
例句：
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1. The craneoperator must be careful not to overload the lever.
吊车操作员必须小心，不要超载杠杆。
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2. The crane was used to lift heavy loads from the ground.
起重机被用来从地面上举起重物。
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3.The lever is designed to make lifting heavy objects easier.
这个杠杆设计成使提起重物更容易。