Definition
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air
Air is the invisible mixture of gases that surrounds the Earth and is essential for human and animal life.
空气是围绕地球的看不见的气体混合物,对人类和动物的生命至关重要。
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The air in the mountains is fresh and invigorating.
山区的空气清新而令人振奋。
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We need to ventilate the room to let in some fresh air.
我们需要通风以让新鲜空气进入房间。
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On a hot day, the air feels heavy and humid.
在炎热的日子里,空气感到沉重而潮湿。