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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；
例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

pistons

n. <机>活塞( piston的名词复数 )；
例句
The pistons are graphite-coated to reduce friction.
活塞上涂了一层石墨以减小摩擦力。

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）；
例句
We are scared to abandon ourselves to our feelings in case we seem weak or out of control.
我们不敢放纵自己的情感，以免显得太过软弱或缺乏自制。

to

prep. 向，朝着，到，关于，属于；adv. 朝一个方向的，到某种状态，关闭；
例句
I suggest you leave it to an expert...
我建议你把它留给专家来解决。

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；
例句
He urged the administration and Congress to come up with a credible package to reduce the budget deficit.
他敦促政府和国会出台一整套切实可行的方案，以缩减预算赤字。

friction

n. 摩擦，冲突，不和，摩擦力；
例句
Sara sensed that there had been friction between her children...
萨拉感觉到她的孩子之间有过争执。
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他当众承认自己可能犯了个错误。
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He who spares his rod hates his son, But he who loves him chastens him early.
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撒切尔女男爵的主张在很多人看来是可信的。
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Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
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