At least one aperture extends through the substrate from the first surface to the second surface, and has a first open area.

至少一个孔口从所述第一表面至所述第二表面延伸通过所述基底，并具有第一开口区域。

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The component has a first coating on at least one of the first surface and the second surface adjacent to the at least one aperture.

部件具有在邻近所述至少一个孔口的所述第一表面和所述第二表面的至少一个上的第一涂层。

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She took it calmly at first but under the surface was seething.

她起初处之泰然，但内心却是气呼呼的。

《柯林斯英汉双解大词典》

But California officials recently registered objects left by the first men to land on the moons surface.

VOA: special.2010.03.02

The way we did this was to coax embryonic stem cells first to develop into the surface layer.

我们是这么做的,先诱导胚胎干细胞,发育成外胚层。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

First is that the ear develops from the surface layer of the embryo.

耳朵是由,胚胎的外胚层发育来了。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选

You can tell Microsoft is especially proud of this detail: the first Surface ad emphasizes that feature to the point where Windows RT's various features more or less take a backseat.

ENGADGET: Microsoft Surface: inside the three-year secret project to build the first great Windows tablet

When the Viking lander 1 landed on July 20, 1976, it sent back the first pictures from the surface of Mars.

NPR: Revisiting the Viking Missions to Mars

The pattern of the game stayed the same in the second half with Perm pushing strongly for the first strike on the artificial surface.

BBC: Amkar Perm 1-0 Fulham (agg 2-3)