Please close a door to keep the cold air out.

请关上一扇门，以免冷风进来。

The worker calked the windows to keep the cold air out.

工人用防水材料密封了窗户以防止冷空气进入。

Who let out the air out of my tyres?

谁放了轮胎的气? 放出(气体)(引申)

You've let all the air out of the tyres.

你让车胎的气都跑光了。

We were also told air-out inside of garage is 50% good air and 50% bad air.

我们还被告知空气进行车库内50％良好的空气和50％的空气不好。

It's time to go home, let the air out of the air bed.

该回家了，咱们把气垫床的气儿放了吧。

It ' s time to go home , let the air out of the air bed .

该回家了，咱们把气垫床的气儿放了吧。

This valve lets air into the pipe, but will not let air out of the pipe.

这种阀门，让空气进入管道，但不会让空气的管道。

The balloon pumps air in to make itself heavier, or lets air out to make it lighter.

通过打气可以让气球变重，通过放气让它变轻。

Fishes breathe air as we do, but it is the air which is mixed with the water. The fish draws this air out of the water by its gills.

金鱼也跟人类一样呼吸空气, 不过呼吸的是溶解在水里的空气。金鱼是用鳃吸进水里的空气的。