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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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