When driving in a car on a hot summer day, you may see what looks like shimmering water on the road, which, as science tells us, is really just a mirage, an illusion caused by the heating of the air.

在炎热的夏天开车时，你可能会在路上看到闪闪发光的水，但科学告诉我们，这其实只是海市蜃楼，是空气加热造成的幻觉。

youdao

ii. Tap water, heating, air conditioning, hot water, coal gas, lipuefied petroleum gas, naturalgas, methane gas, coal/charcoal products for household use;

自来水、暖气、冷气、热水、煤气、石油液化气、天然气、沼气、居民用煤炭制品；

youdao

On the first filling of the hot water heating system or refilling after maintenance, air in the piping and radiation must be removed and the whole system filled with water.

在对热水加热系统进行首次进水或维护后在进水，管道和散热器内的空气必须被排除出来，整个系统必须用水充满。

youdao