The switch works by passing a pulse of current between the tip and the surface.

电源开关的工作原理是让电流脉冲穿过触点和触面之间。

《柯林斯英汉双解大词典》

In the simplest setup, the size of the current reveals the density of electrons in the surface, allowing it to be mapped out.

在这个最简单的装置里，电流的大小表明了样品表面电子的密度，并能绘制出来。

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For a time, surface and subsurface current are in opposite directions; flow is seaward at the surface and landward near the bottom.

在一个时期，表层和次表层的水流方向相反；表层水流向外海方向流动，靠近底层的水流则向陆地方向流动。

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The satellite built in collaboration with France will carry two climate tools developed for analysing ocean current and sea surface heights by the French space agency CNES, reports say.

BBC: India launches seven satellites

On Europa this induces an electrical current within the sub-surface ocean.

ECONOMIST: Blue moon

It is also possible that a new offer on devolved powers to Scotland may surface, superseding the current Scotland Bill, which has been in limbo for rather a long time.

BBC: The year ahead in Parliament