With a low-pitched rumbling noise, the propeller began to rotate.

随着低沉的隆隆声，螺旋桨开始旋转起来。

《柯林斯英汉双解大词典》

What causes my stomach to make a low continuous noise when I'm hungry?

当我饿的时候，是什么让我的胃发出一种低而连续的声音？

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This refrigeratory is a low noise design.

这冰箱是一个低噪声设计。

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The Leica M8 doesn't just have a pretty body, nor is it resting on the laurels of its predecessors: it's got a 10.3 megapixel resolution, with a low-noise CCD image sensor that starts at ISO 160 but that can also kick up to ISO 2500.

ENGADGET: Leica M8 combines old-world charm with new-world tech

So you need a powerful low-noise amplifier.

ECONOMIST: MONITOR

In the London area there's a constant low-level clacking noise in the background, reminiscent of the typing pools of yore.

BBC: Why air traffic control still needs the human touch