The heat wave was the latest in a series that have swept over the Arctic in recent winters.

热浪是最近几年席卷北极的一系列最新的热浪。

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That is why the Spanish flu virus, the new swine flu virus and some of the human flu viruses circulating in recent winters can all be H1N1 viruses and yet look and behave so differently.

这就是西班牙病毒，新型猪流感病毒和近期在冬季流行的人流感病毒能够有如此不同的表现的原因。

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This was partly because of a plague of bark-beetles in its temperate and boreal zones, a record number of which have been surviving the recent mild winters.

造成这种损失的部分原因要归结于温带和针叶林带里爆发的小蠹虫虫害，创纪录数量的小蠹虫撑过了最近这些个温和的冬天。

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Work continued throughout one of the worst winters in recent years.

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In any event, recent British Columbian winters have not been cold enough to kill the beetles.

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It said the population in the area was about 1, 000 adult males, which showed a recovery after numbers fell following recent hard winters.

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