可能很多人还不清楚这种简单机械的原理。
Many people may also not such a simple mechanical principle.
现代机器虽复杂,但实质上不过是简单机械的组合。
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。
Complicated as a modern machine is, it is essentially a combination of simple machines.
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