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machine-spare-parts-ji-jie-ling-jian

Machine Spare Parts 机械 零件

Machine - an apparatus using mechanical power and having several parts, each with a definite function and together performing a particular task.

机械就是能帮助人们节省工作难度或省力的工具装置。有一些机械单纯转换力的大小或(及)方向,被称为简单机械