Every cold period has nine days.

每个寒冷期是九天。

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The whole tropical tropopause has been warmed up from cold period to warm period.

从偏冷期到偏暖期，整个热带对流层顶显著变暖。

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For instance, a 100-year cold period beginning in 1560 caused shortened crop-growing seasons.

例如始于1560年的100年冷期，造成了农作物生长期的短缩。

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The unusually long period of cold weather has shown how even warm climates can sometimes freeze over.

VOA: special.2010.01.12

The hot line had an important purpose: to prevent accidental war between the two competitors during the period known as the Cold War.

VOA: special.2009.12.06

During the period of the Cold War, an estimated 30 million people in Eastern Europe and the Soviet Union listened to him on the radio.

VOA: special.2009.01.30

And Tkachov vowed at a public meeting that the government will "build... a new home for you in three to four months, before the beginning of the cold period, " according to the same report.

CNN: July 9, 2012 -- Updated 0150 GMT (0950 HKT)

There is clear evidence that winter storms throughout southern Scandinavia were more frequent and intense during the multi-century Dark Ages Cold Period and the much more recent Little Ice Age than either now or other comparably warm periods.

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Much of the work in developing and manufacturing chemical weapons occurred during the Cold War period.

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