Drop several seeds over the surface of the pot and cover with a thin layer of vermiculite, a substance that can hold air, water and nutrients.

VOA: special.2009.04.21

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

Drop the seeds over the surface and cover them lightly with soil.

VOA: special.2009.04.28

Volcanic activity broke the large island into pieces that came to the surface of the sea over time.

VOA: special.2009.12.16

Experts say Aquarius will gather as much information about sea surface salinity as has been collected by ships over the past one hundred twenty-five years.

VOA: special.2011.06.22

"We know that surface use of dispersants decreases the environmental risk to shorelines and organisms at the surface and we know that dispersants break down over weeks rather than remaining for several years as untreated oil might."

VOA: standard.2010.05.18