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The pistons are graphite-coated to reduce friction.是什么意思？

The pistons are graphite-coated to reduce friction.

活塞上涂了一层石墨以减小摩擦力。

相关词汇
the pistons are to reduce friction

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

pistons

n. <机>活塞( piston的名词复数 )；

are

vi. （用于第二人称单复数现在时，第一、三人称复数现在时）是；n. 公亩（等于100平方米）；

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；

reduce

vt. 减少，缩小，使还原，使变弱；vi. 减少，节食，蒸发，（液体）浓缩变稠；

friction

n. 摩擦，冲突，不和，摩擦力；
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