The level of pollution in the river was falling.

该河流受污染的程度其时正在降低。

《柯林斯英汉双解大词典》

The rain was falling steadily.

雨不停地下着。

《牛津词典》

Snow was falling heavily.

正下着大雪。

《牛津词典》

The number of visitors was falling. So a campaign was launched to give the city a new image.

VOA: special.2009.12.27

And the idea was that gravity did work on the water and falling, and that work led to the generation of heat.

焦耳的想法是,重力对水，做了功。

麻省理工公开课 - 热力学与动力学课程节选

so I actually was like almost falling asleep in the second half, so you know.

我后半程几乎都快睡着了。

来伦敦旅游的 - SpeakingMax英语口语达人

In it, she described how the pilot was falling into disrepute and it should stop.

BBC: Community service plan 'failing'

Chinese fertility was falling for decades before the one-child policy took effect in 1979.

ECONOMIST: China's family planning

Her marriage was falling apart, her car had been repossessed and her home faced foreclosure.

FORBES: Entrepreneurs