He needs to warm up before the race begins.

他比赛前需要热身。

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Your body needs to warm up and you need to give yourself a chance to reach faster rates of breathing in a controlled way.

你的身体需要热起来，而你需要给自己一个机会，使呼吸以可控制的方式达到更快的速率。

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To form a tornado, cold air must sit above warm and moist air, and the wind needs to go in different directions at different heights, creating shear forces.

形成龙卷风，寒冷的空气必须处在暖湿的空气上部，而风应该在不同高度向不同的方向运动，以此创造出剪切力。

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Are you generally warm and considerate, but with the ability to be straightforward and firm when needs be?

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Heaters, blankets, warm clothing and heating fuel are some of the most pressing needs for the winter months, in addition to food, shelter and mattresses.

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