Within a vertical distance of just a few tens of meters, trees disappear as a life-form and are replaced by low shrubs, herbs, and grasses.

就在几十米的垂直距离内，树木这种生命形式消失了，取而代之的是低矮的灌木、草本植物和小草。

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PROBLEM: Wi-Fi USES frequencies that can't carry a signal more than a few tens of meters.

问题：Wi - Fi使用了传送信号距离不超过几十米的频率。

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A drill assembly is typically a few tens of metres long and can only hold a core of ice of the same length.

一个钻取机通常有数十米长而且只能获取一个与之等长的冰芯。

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Just spend a few millions, a few tens of millions maybe, on the machinery and produce away.

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They contain thousands to millions of stars packed into a region of space just a few tens of light-years across.

BBC: NEWS | Science/Nature | Black hole found in ancient lair

The most promising sail material has a carbon-fibre backing coated with a thin layer (just a few tens of atoms thick) of aluminium.

ECONOMIST: Rockets are not the only way to travel through outer space