On a tree next to a river in Amsterdam, a tiny birdhouse glows (发光) bright green when the air is clean.

阿姆斯特丹河旁的一棵树上，一小小的鸟舍会在空气清新的时候发出明亮的绿色。

youdao

I breathed the fresh air on the mountain and sometimes I went swimming in the river.

我在山上呼吸新鲜的空气，有时在河里游泳。

youdao

There are some constraints: Because the process relies on condensation, it requires a humid environment, as well as a source of temperatures colder than the surrounding air, such as a cave or river.

这种充电方法也有局限，因为充电过程依赖于液体凝结，需要一个潮湿的环境，且局部温度要低于环境温度才行，如山洞或者河流。

youdao

The Russian Ministry of Emergency Situations, or Emercom, published the full list of the 45 passengers on board a plane that exploded mid air and crashed in the Volga River on Wednesday afternoon in central Russia.

FORBES: Names Of Deceased KHL Hockey Players Released In Russia

But a report to Devon County Council raised concerns about the effect on the landscape, air and the River Yealm.

BBC: Lee Mill incinerator plans rejected

The Columbia and Snake River system allows large volumes of freight to be moved with negligible impact on air quality, and replacing this transportation capacity would require use of 120, 000 rail cars or 700, 000 trucks.

CNN: Snake River dam resolution called unfair