They compare average temperatures at any given time and place to a long-term average, or base period, for each area.

在每个地区，他们都用一个时间点的平均气温和长期或者一段时间内的平均气温进行比较。

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With the economy remaining frail, the base rate looks set to stay at 0.5% for a long time.

在经济还很孱弱的情况下，基础利率似乎会长时间地钉在0.5%上。

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As long as each guide contains the sections covered in this article, you have a good base for your documentation that you can easily add to as time goes by.

只要每个指南包括本文中涵盖的部分，就获得了进行文档记录工作的良好基础，可随时方便地添加所需内容。

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Created by long-time base jumper and skydiver, Ossie Khan, and shot over a two-year period, Experience Zero Gravity reveals some of the most stunning base jumping locations in Europe.

BBC: Base jumping: The serene side we��ve never seen

Duties: For the first time, B-2 bombers will fly missions from an overseas base instead of the long, round-trip flights it has previously made from Whiteman Air Force Base.

CNN: 509th Bomb Wing