接下来，您需要选择一个长度。

You next need to choose a length.

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由于这样的替换可能具有任何长度，在内容助理选择窗口中显示它是没有意义的。

As such a replacement can be of any length, it would not make sense to show it in the content assistants proposal selection window.

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接下来他们必须决定一种“自然的”长度，他们选择了从赤道到北极距离的一千万分之一，他们将它称作一米。

Next they had to decide on a "natural" length. They chose one ten-millionth of the distance from the Equator to the North Pole.

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