And that's because it's easier to test small things than big things. And it's easier to debug small things than big things.

这是因为对小一点的对象,进行测试比对大一点的对象进行测,试要简单多了，调试也是如此。

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That means we can also measure velocity slightly later and make the slightly later come as close to right now as we want.

那我们也可以测出稍微迟一点的速度,让那个速度接近我们前面测得的速度

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