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。
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。
By comparing the intensity of the hum with the height of waves around the world, scientists can track where the buzz is coming from.
通过把全世界海浪高度和嗡嗡声的强度相比较，科学家能追踪到这种声音的来源。
Relax to the music of the masters; listen to the symphony of nature - the hum of the wind in the treetops, bird songs, thundering surf.
放松倾听大师们的音乐，聆听大自然的乐章——风在树梢的私语，鸟儿的歌唱和惊涛拍岸之声。
There came the hum of machines.
传来了机器的隆隆声。
There was the hum of bees, and the musky odor of pinks filled the air.
蜜蜂嗡嗡地哼，石竹花的芳香在空气中飘溢开去。
For a long time the only sound was the hum of the motor and the tires on the pavement.
很长时间里，唯一的声音就是马达的嗡嗡声和轮胎在路上的磨擦声。
A sound rose slowly from the Queen Grove as she spoke, deep and resonant, like the stroke of a big, old clock or the hum of a harp.
这时从皇后林那边传来引起共鸣的低沉声音，像一座大旧钟发出的钟声或是竖琴发出的嗡嗡声。
I stepped out onto the 15th-floor balcony of my fancy hotel room to hear the hum of the city and to enjoy the view of a vast, twinkling city at twilight.
我跨进漂亮酒店15楼的阳台去听一听大城市发出的喧闹声，欣赏城市在日暮时分的景色。
All the sounds of man, the bleating of sheep, the cries of birds, the hum of insects, the stir that makes the background of our lives - all that was over.
属于人的喧嚣，羊群的叫声，鸟儿的鸣啼，昆虫的嗡嗡声，那一切嘈杂人世的配乐—全化成过眼云烟。
嗡嗡的读书声停止了。
The hum of the surrounding city was faint, the clang of an occasional bell was as music.
周围闹市的嘈杂声只能隐约地听到。偶然传来一声钟声，像音乐一样悠远。
The hum of the surrounding city was faint, the clang of an occasional bell was as music.
周围闹市的嘈杂声只能隐约地听到。偶然传来一声钟声，像音乐一样悠远。
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