冷空气

Watt's engine also used hot steam , not cold air, to force down the piston.

瓦特的发动机也是利用热空气而不是冷空气带动活塞.

The dough shrank slowly in the cold air.

面团在冷空气中慢慢收缩了.

Cold air is actively burrowing under warm air.

冷空气快速地潜入到暖空气下面.

A very active cold front brought dramatic weather changes to Kansas on Wednesday.

一股强冷空气前锋周三使堪萨斯的天气发生了剧变。

Great tongues of cold air at times sweep down over North America.

巨大的冷空气“舌”常常侵袭北美.

The fire in the furnace warms this cold air.

炉灶里的火对进来的冷空气加热.

All China was in the grip of a deep cold outbreak.

全中国都在深厚的冷空气爆发的控制之下。

But cold air does not always cause a cold.

但是冷空气不一定引起感冒.

The cold air made her face tingle.

冷空气冻得她的脸发痛。

Blasting cold air over it makes the water evaporate.

向它喷射冷空气可以使水蒸发。

Why does this work? Hot air rises because it weighs less than cold air.

为什么会这样 呢 ?这是因为热空气比冷空气轻,所以会上升.

Warm air can contain more water vapor than cold air.

热空气要较冷空气容纳更多的水蒸汽.

Cool air whooshes up through the grates on the street.

冷空气吹得大街上的格栅呜呜作响。

Woods on a slope below an orchard may retard movement of cold air downward.

如坡地果园的下方有森林容易阻碍冷空气向下排出.

If a train entered this tunnel, itwould draw in fresh air behind it.

如果火车开进这条隧道, 它会抽进新鲜冷空气.