任何机器无论多简单都是由单个零件组合而成的，这些零件通常被称为机械零件或部件。
The term computer is used to describe a device made up of a combination of electronic and electromechanical(part elecrtonic and part mechanical) components.
机器由许多机械零件组成，最常用来传动的机械零件是齿轮。
A machine consists of a number of machine elements. The most useful machine elements in power transmission is the gear.
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