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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It's true that severe cold can throw plans and schedules into disarray, but around the world we've figured out various winter delights that make a deep freeze seem–well, almost welcome.

尽管严寒可能打乱了许多计划以及日程安排，但在世界范围内，我们已经看到各式各样冬季带来的欢乐，这也使得人们似乎不再那么抗拒严寒。

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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