The hum of the Fiat's engine, the flow of rubber on asphalt, the smell of rain and wet, distant wool—these were enough to keep me going on.

菲亚特引擎的嗡嗡声，橡胶轮胎在柏油路上前进，雨水和潮湿的气味、远处的羊群——这些足以让我一直前进。

youdao

You notice the hum of the air-conditioner when it comes on and when it goes off – but not in between.

空调开启和关闭的时候你会注意到嗡嗡的声音，但在运行中你就很少注意到。

youdao

If you're walking indoors, notice the sound of other people talking, the sound of footsteps and the hum of lighting fixtures.

如果你是在室内行走，留意人们的说话声，脚步声和照明灯具发出的嗡嗡声。

youdao

The hum of the spinning blades is the sound of China going green as it seeks to address the growing energy demands of its rapidly modernizing consumer society and fast-paced industrialization.

VOA: standard.2010.08.03

And perhaps the explanation has got to be the ubiquity of death is this kind of background, constant hum.

也许应该这么解释，死亡的无处不在,是一种背景的，持续的嗡嗡声。

耶鲁公开课 - 死亡课程节选

If you want to hum the piece quietly to yourself, that's fine; that's good.

如果你想自己跟着曲子,小声哼哼,没问题,那很好

耶鲁公开课 - 聆听音乐课程节选

The hum of improvised conversation, the rustling of newspapers turning, the clinking of cutlery.

BBC: Vienna��s recipe for living well

Giant lathes and centrifuges surround our metallic table, and the hum of machinery fills the air.

FORBES: How Nathan Myhrvold's Modernist Cuisine Became The World's Most Influential -- And Profitable -- Cookbook

We did notice, however, that the mic was able to detect the hum from our MacBook Pro's fan.

ENGADGET: Blue Microphones Tiki USB microphone review: a thumbdrive-sized mic for mobile recording