1.
"Hot air is lighter than colder air," they said. "That is why hot air goes upwards.
他们说：“热空气比冷空气轻，因而热空气会向上升。
2.
air proportional EGR system
空气比例式ＥＧＲ系统
3.
air-gas proportioner
空气煤气配比调节器
4.
ratio of injected air to produced oil
注入空气-采出原油比
5.
The air is fresher in countryside than in city.
乡下比城里空气新鲜。
6.
An airship depends on a gas that is lighter than air.
而飞艇依靠的是一种比空气轻的气体。
7.
air at a pressure greater than that of the atmosphere.
承受的压力比大气压力大的空气。
8.
Air at higher levels may remain warmer than that near the ground.
高层的空气可能比接近地面的空气较为暖和。
9.
A space in which the pressure is significantly lower than atmospheric pressure.
真空般状态压强明显比大气压强低得多的空间
10.
Comparison of Oxy-fuel Firing and Air combustion In glass furnace combustion space
全氧燃烧与空气助燃玻璃窑炉燃烧空间比较
11.
prorated emission charge on air pollutants
按比例摊派的空气污染物排放费
12.
Compared with the previous year, the urban air quality remains unchanged.
与上年相比，城市空气质量基本持平。
13.
Is the room warmer than the cold air outside?
房间里会比外面冷空气暖和吗？
14.
Water retains heat much longer than air.
水比空气保持热量的时间要长得多。
15.
It travels more than four times faster in water than in air .
声音在水中比在空气中传播快4倍多。
16.
How much does sound travel faster in water than in air ?
声音在水中比在空气中传播快多少?
17.
As a result, a more even air-fuel ratio is maintained.
因此，能维持合适的空气与燃料之比。
18.
In contrast, in space there is an absence of weather and therefore no such interference.
相比之下，太空中没有恶劣天气的干扰。