Now, we will add a new layer in front of the background layer and behind the others.

现在我们在背景图层前添加一个新的图层。

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Just like the human eye Smart Eyes is able to distinguish different objects, even if they are moving on front of a busy background.

像人眼一样，电子眼能够辨别不同的物体，即使它们在一个杂乱的背景下移动。

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If a large object passes in front of a more distant background star, it may act as a lens, bending and distorting the light of that star so that it may appear to brighten significantly.

如果一个体积足够大的星体从一个距离很远的恒星前面经过，那么会产生透镜效果，使那个恒星的光线产生弯曲或变形，这样就能很清楚的看到这个星体。

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And, furthermore, to put the background in front, 1s2 2s2 2p3 let's do the electronic structure. It is 1s2, 2s2, 2p3.

此外，把他的背景知识都翻出来，我们分析一下电子结构，这是。

麻省理工公开课 - 固态化学导论课程节选

The site, hillaryclintonoffice.com, contains nothing but a big picture of Clinton in front of a blue background and an expandable contact form allowing site visitors to reach out to Clinton for scheduling requests, media inquiries and whatever else they might want to speak to her about.

FORBES: Hillary Clinton Launches A New Website, But What Is It For?

We see two men standing side by side in front of a featureless, white background.

NPR: Ad Report Card: Apple's Sour Mac Pitch

All of this occurs in front of a seemingly unrelated tropical fish background.

ENGADGET: BlackBtrry Water Game hands-on Hands-on