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。
2
With the economy remaining frail, the base rate looks set to stay at 0.5% for a longtime.
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。
3
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.