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Levers and pulleys are simple machines.

杠杆和滑轮是简单机械.

《现代英汉综合大词典》

The pulley is considered one of the five simple machines.

滑轮被认为是五种简单机械之一.

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Lever: Simple machine used to amplify physical force.

杠杆: 用来增大力量的简单机械.

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Able to perform simple assembly operations.

能够从事简单机械装配.

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Complicated as a modern machine is, it is essentially a combination of simple machines.

现代机器虽复杂, 但实质上不过是简单机械的组合.

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Complicated as modern machine is, it is essentially a combination of simple machines.

现代化机器虽复杂, 但实质上不过是许多简单机械的组合.

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