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Levers and pulleys are simple machines.是什么意思？

Levers and pulleys are simple machines.

杠杆和滑轮是简单机械.

相关词汇
levers and pulleys are simple machines

levers

n. <物>杠杆( lever的名词复数 )，操作杆，施压的行为；

and

conj. 和，与，而且，于是，然后，因此；

pulleys

n. 滑轮（组），滑车( pulley的名词复数 )，皮带轮；

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）；

simple

adj. 简单的，单纯的，易受骗的，天真的；n. 笨蛋，愚蠢的行为，出身低微者；

machines

n. 机器( machine的名词复数 )，机械装置，机动车辆，飞机；
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You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
He sat there while I made the case for his dismissal...
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一份耕耘，一份收获。
This decree obliges unions to delay strikes.
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追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
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Comparative evolutionary analysis of lepidopteran identification of previously neglected coding genes as markers.
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Both tests are also done to see if treatment is destroying leukemic blast cells.
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