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- Air is shapeless. 空气是没有定形的。
- The transport of goods by air is very expensive. 空运货物费用十分昂贵。
- Air is a mixture, not a compound of gases. 空气是气体的混合物，不是化合物。
- Fresh air is conducive to health. 新鲜空气有助于健康。
- The air is infected with noisome gases. 空气受到了有害气体的污染。
- Fresh air is beneficial to our health. 新鲜空气有益于健康。
- The foul air is unfit to breathe. 骯脏的空气不适宜呼吸。
- Doing exercises in the open air is good for your health. 露天锻炼身体有益你的健康。
- The morning air is infused with something very nice. 清晨的空气十分宜人。
- The higher you climb up the mountain, the rarer the air is. 越往山上爬，空气越稀薄。
- Air is shapeless 空气是没有定形的。
- Cold air is actively burrowing under warm air. 冷空气快速地潜入到暖空气下面。
- Heated air is forced into the upper tier of ducts. 加热的气流被送入上面的一排管道。
- Air is to men as water us to fish. 空气之于人犹如水之于鱼。
- If air is needed, the oxygen mask in the plane will pop down by itself. 如果空气缺乏，飞机内的氧气面罩会自动放下。
- Before mixing with the products of combustion, the air is preheated. 空气在与燃烧生成物混合之前要进行预热。
- The air is loaded with smoke and dirt. 空气里弥漫着烟雾和尘埃。
- The supply air is fed into a raised floor plenum. 这些补充进来的空气被导入活动地板的夹层里。
- The air is perfumed with the rose flowers. 空气中充满着玫瑰香味。
- Pure air is colourless and odourless. 纯空气是无色无臭的。
