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Constant wheelchair use will scuff almost any floor surface.

经常有轮椅在地板上走动，几乎任何地板都会有所磨损。

《柯林斯英汉双解大词典》

Air pressure on the surface of the Earth is fairly constant, so in designing a microphone for use on land, engineers don't have to worry about large variations in air pressure.

地球表面的气压相对稳定，因此设计地面用的传音器，工程师并不需烦恼气压的大幅变化。

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When you're falling to the surface of the Earth, you are describing a problem of constant acceleration.

当你讨论下落问题时,你在描述一个加速度恒定的问题

耶鲁公开课 - 基础物理课程节选

It is a dynamic planet whose surface is in constant flux.

ECONOMIST: Martian chronicles

Compared with the sluggish air on Earth, the Martian atmosphere is in constant motion: between the surface and six feet above it, temperatures can vary by as much as sixty degrees.

NEWYORKER: The Martian Chroniclers

But beneath the surface, there is the CIA officer's constant and often uncharitable assessment of the target's aspirations, fears and desires.

WSJ: The Spy Who Turned Me