Beneath the typical tree, roots generally reach half as deep and twice as wide as the tree we see above ground.

一些典型的树种地下的根系深度是树高的一半，而根系的横向范围和我们看到的地上的树木范围一样宽。

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If it is to be installed in seas 40 metres deep, its pylon and foundations must measure 170 metres or so, half again as high as st Paul's Cathedral.

如果把它安装在40米深的海中，它的电缆塔的高度得大约170米，是圣彼得堡大教堂高度的一半。

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It is advised that next transient testing operation is necessary to be done in half a year so as to evaluate deep gas reservoir in Shuangtuozi gas field and reasonably develop it.

建议在生产时间为半年时，对井重新做一次不稳定试井测试，以指导双坨子深层气藏储层评价及合理开发。

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Scoring opportunities were few and far between in a drab opening half-hour as St Mirren appeared content to sit deep and hit Celtic on the break.

BBC: Sport - Football - St Mirren 0-1 Celtic

But their ambition cost them a hard-earned bonus point as they attacked from deep in their own half.

BBC: Dragons 23-10 Connacht

The decisive second goal came deep into the half when Lionel Messi (who came on as a second-half substitute) bagged his 17th consecutive league goal in the 88th minute, deftly putting the ball over goalkeeper Aranzubia.

CNN: Barcelona down Deportivo ahead of AC Milan showdown