It happens on hot days more than on cold, which leads to speculation that the action cools the brain.

热天比冷天打哈欠多，人们猜测，这种动作能给大脑降温。

youdao

That means more cold air pooling in the valleys and more extreme temperature differences, which could disrupt the local ecosystem.

这就意味着有更多的冷空气聚集于山谷，温差将急剧增大，从而破坏当地的生态系统。

youdao

East Asia, the other big potential battlefront in the cold war, used to look very different from Europe, which has long had more than its share of shock-absorbing regional clubs and institutions.

东亚是冷战时另一个大的潜在前线，在过去与欧洲相比十分不同；长久以来，欧洲地域性俱乐部和机构的数量多于它这个规模应该有的。

youdao

Addressing reporters in the White House briefing room, President Obama said the agreement moves the world closer to the goal of a more secure future without such weapons, which he said represent both the darkest days of the Cold War, and the most troubling threats of our time.

VOA: standard.2010.03.26

If firms create fewer jobs, or even lay people off, consumption could catch a cold which would mean more saving and even bigger external surpluses.

ECONOMIST: The frugal giant

Data fades from memory much more slowly when chips are cold which allowed them to grab the encryption keys and speed up unscrambling the contents of a phone.

BBC: Frozen Android phones give up data secrets

She said that this year's conditions were partly caused by a move to a negative phase of the North Atlantic Oscillation which would be likely to lead to more frequent cold, drier winters - like the 1960s - and also wetter summers for 10-20 years.

BBC: UK experiences 'weirdest' weather