Is the air around you cold or warm?
你周围的空气是冷还是热？
When it's really cold, wear a face mask or a scarf over your mouth to warm the air you breathe and protect your face.
很冷的时候，戴一个面罩或者围巾遮住嘴，可以给你呼吸的空气保点温，同时也可以保护你的脸。
A reversible heat pump provides warm or cool air.
一个可逆热泵装置为室内提供了温暖或凉爽的空气。
This can occur particularly when the air temperature is warm or hot.
该情况在环境空气温度较高时更容易发生。
Don't set the air conditioner too cool in summer or too warm in winter.
在夏天不要将空调开得过冷，冬天不要使它过热。
Don't set the air conditioner too cool in summer or too warm in winter.
在夏天不要将空调开得过冷，冬天不要使它过热。
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