该理论认为，围绕在深色虹膜和瞳孔周围的白色巩膜帮助人们判断出其他人在看哪里。

The theory is that a white sclera surrounding a darker iris and pupil helps people work out where everyone else is looking.

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围绕在月球陨石坑周围的喷出物，正是人们所能预料到的在一次爆炸中能得到的物质，爆炸喷发出大量灰尘、土壤和岩石。

The ejecta surrounding the lunar crater is just what one would expect from an explosion ejecting a large volume of dust, soil, and boulders.

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So, an energy deficit, accelerating charge, the accelerating negative charge, because it's the negatives that are orbiting the positive center.

能量的损失，加速电荷，加速的负电荷，因为这是负电荷,围绕在正电荷中心的周围。

麻省理工公开课 - 固态化学导论课程节选

According to this theory, the atoms consist of a positively charged nucleus surrounded by a stream of electrons kept together by attractive forces from the nucleus.

根据这个理论，原子由一个带正电荷的核组成,由于来自核的吸引力,电子流围绕在核的周围。

麻省理工公开课 - 固态化学导论课程节选

So I said that we want to be talking about valence electrons here, so that means if we're talking about, for example, the octet rule for an f f molecule where we have two fluorine atoms, we need to write the valence electrons as dots around them.

我说过我们在这要讨论的是价电子，这就意味着，如果我们要讨论，比如，关于两个氟原子组成的分子的八隅体规则,我们首先需要把价电子画成围绕在它们周围的点。

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