Hypothermia is a more severe response to cold exposure that is defined as a significant drop in body core temperature.

低体温是由寒冷暴露引起的更加严重的反应。它的定义是身体核心温度的骤然下降。

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And in general, flu symptoms including fever and chills, sore throat and body aches come on suddenly and are more severe than cold symptoms.

一般来说，流感症状包括突然出现的发烧、发冷、喉咙痛和身体疼痛，而且比普通感冒症状更严重。

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While cold symptoms tend to occur gradually, flu symptoms start very suddenly and symptoms are more severe than cold symptoms.

感冒症状通常是逐渐发生，但流感开始得非常迅猛而且症状比感冒更严重。

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In severe cold, below -15C, before you turn the ignition key flash your main beams - this takes a bit of battery power and thaws it a bit inside.

BBC: Your tips for coping in a colder UK climate

After the severe weather, a cold-weather system could bring snow and freezing rain to the Midwest, beginning Wednesday, and the threat of extremely cold weather in the northern Plains states and Upper Midwest, particularly on Thursday.

CNN: STORY HIGHLIGHTS

Symptoms and duration of cold were also much less severe - by about a third each - the researchers said.

BBC: Adults have two colds on average each year