This was the key to a successful underwater expedition.

这是水下探险成功的关键。

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Scientists agree that the key player in this scenario is the West Antarctic ice sheet, a Brazil-size mass of frozen water that is as much as 7000 feet thick.

科学家们一致认为，这一情境中的关键推手是南极西部的冰层，这是一块跟巴西（面积）差不多大小的冰原，厚达7000英尺。

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This is a silver key.

这是一把银色的钥匙。

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Homeland Security Secretary Janet Napolitano, a key figure behind this week's aid package, will visit Mexico early next month along with U.S.

VOA: standard.2009.03.25

This is a key to his character; these two episodes are the two that we're given of Moses' life.

这也是他性格的一大特点;,这是我们所看到描写摩西生平的两个片段。

耶鲁公开课 - 旧约导论课程节选

But there's a key line of code that I lost over a moment ago and that was this one here.

但是我刚才漏了一行关键的代码,就是这里的这一行。

哈佛公开课 - 计算机科学课程节选

She said having a cycling network would make cycling a "desirable choice, " with this a key time to get more people on a bike before the "Olympic buzz dwindles".

BBC: Cyclist

Two-thirds (66%) of the respondents said the level of deposit required was the main barrier to arranging a mortgage, citing this as a key reason for not being able to buy a new home.

BBC: House for sale

The key is to understand that this is a key component, a key part of a comprehensive strategy to move us from an economy that just runs on fossil fuels to one that relies on more homegrown fuels and clean energy.

WHITEHOUSE: President Obama Visits Wind Turbine Blade Plant