The latter two sources are limited to those few areas where surface water seeps down through underground faults or fractures to reach deep rocks heated by the recent activity of molten rock material.

后两种来源局限于少数区域，在这些区域，地表水通过地下断层或断裂往下渗透，从而接触到被近期的熔岩活动加热的深层岩石。

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The purposeful collective activity of ants and other social insects does, indeed, look intelligent on the surface.

蚂蚁和其他群居性昆虫有目的的集体活动表面上看起来确实是有智慧的。

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Others show extreme close-ups of activity on the Sun’s surface.

其它一些图片则给太阳表面的极端活动做了特写。

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

VOA: special.2009.12.16

In this case, a receptor tyrosine kinase is a receptor molecule that binds a ligand at its surface outside the cell and initiates this enzyme activity - this kinase activity - and causes phosphorylation of another molecule.

在这个例子中,酪氨酸激酶受体可以,在细胞表面区域与配体结合,从而激发出,激酶的活性,使其能够磷酸化另一类分子

耶鲁公开课 - 生物医学工程探索课程节选

She found out about the volcanic activity that has shaped the surface of Mars.

VOA: special.2010.07.28

This will be useful because the location and activity of receptor proteins on surface membranes can be a matter of life and death for a cell or a virus.

ECONOMIST: Microscopy

The researchers specifically rejected any assumption that the 1995 increase of hurricane activity was related to any global surface temperature increases over the past century that might be ascribed to anthropogenic (man-made) greenhouse gases.

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Magnetic activity on the stellar surface could also be caused by accretion of material onto it.

MSN: Newborn star's 'heartbeat' seen by X-ray telescopes