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Towers like these were once submerged, but gradually began to become visible as water was diverted into the Los Angeles Aqueduct and the surface level of Mono Lake fell.

像照片中的这些钙华塔一度曾被淹没，然而当湖水改道流入洛杉矶渡槽而在莫诺湖的水面降低的时候，它们会逐渐开始显露出来。

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The teaching content of maths in middle schools contains surface level knowledge and deep level one.

中学数学教学内容分为两个层次：表层知识和深层知识。

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The land surface pokes just a couple of meters on average above sea level, making it the lowest-lying nation in the world.

VOA: standard.2009.10.17

So, one difference between photoelectron spectroscopy and, for example, the photoelectric effect is that in this case, we're not just looking at one energy level, which is what we were looking at from the surface of a metal, now we're talking about this gaseous atom.

光电子能谱与光电效应的不同点在于，以这种情况为例，我们不只关心一个能级，就像原来在金属表面那样，现在我们研究的是气体原子，所以，我们可以从原子中。

麻省理工公开课 - 化学原理课程节选

Are they fearful of a particular outcome that may not be obvious at surface level?

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At surface level, the obsession with vintage clothing among young people may be baffling.

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Beyond analysis this requires impartial investigation that goes beyond surface level inspection.

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