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有了米,为啥还要有千米、毫米?

最直接的理解,为了简洁。

想象一下雕版印刷时代,多刻一些字,要少刻多少书啊?

简单就是力量 。再微小的变化,乘以时间的维度,就会有可观的变化。


不止于此。

当我们频繁使用千米、甚至光年时,我们的思维会不自然地变得开阔;

当我们频繁使用毫米、甚至纳米时,我们的思维会不自然地变得细微。

考虑问题单位的变化,会影响格局的不同。

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