In the heart, action potential is moving from one heart muscle cell to another over the surface of the heart.

在心脏中，动作电位是在心脏表面从一个心肌细胞向另一个心肌细胞传递。

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For over six hours, the planet Venus steadily inched its way over the surface of the Sun.

在6个多小时的时间里，金星在太阳表面稳步前进。

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I try to turn my thoughts towards the spring and sunshine. But there is nothing except grayness over the surface of the deep.

我试着把我的思绪转向春天和阳光。但是除了深海表面的灰色，什么也没有。

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In it,he developed a theory that intelligent life had created waterways all over the surface of Mars.

VOA: special.2010.07.11

Now, in the heart action potential is moving from one heart muscle cell to another over the surface of the heart.

心脏中的动作电位,沿相邻心肌细胞在心脏表面传递

耶鲁公开课 - 生物医学工程探索课程节选

This tactile mastery attests to something remarkable that's happened over the course of the poem, somewhere below the surface of the poem, somewhere between the lines.

这种触觉的掌控证明了一些发生在诗歌里的意义非凡的事情,这些事情贯穿诗歌的整体，暗藏在诗歌的表面之下，深埋在字里行间。

耶鲁公开课 - 弥尔顿课程节选

These will, as their names suggest, crawl over the surface taking samples and pictures.

ECONOMIST: Mars Odyssey

The Surface with Windows 8 Pro (its official name) does include several upgrades over the Surface RT.

FORBES: Microsoft Sets Price, Storage Options For Surface Pro Tablet

They are then mixed together to create a grey powder that floats in alcohol over the surface of the lens.

ECONOMIST: Microelectronics