与刺不同，皮刺能够被轻易地从植物茎上剥落，因为它仅仅是植物外层的一种特征，而不像刺那样是树木的一部分。

Unlike a thorn, a prickle can be easily broken off the plant because it is really a feature of the outer layers rather than part of the wood, like a thorn.

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外层的表格显示了重要的工作项。

The outermost table shows the milestone items.

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外行星是具有气体外层的巨大行星。

The outer planets are giant worlds with thick outer layers of gas.

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There is a huge difference between the energies in the outermost shell and the inner shells, which tells you that it's unlikely that any electrons except those in the outermost shell are going to be active.

最外层和最里层所具有的能量,有很大差异，而这告诉我们有一点是不太可能的,那就是除了最外层的电子,别的电子都是应该是活泼的。

麻省理工公开课 - 固态化学导论课程节选

So, for example, for sodium, we can instead write neon and then 3 s 1.

所以举例来说对于钠其他的外层电子，的结合的电子。

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We can see the early signs of ear development Start with the thickening of the outer layer of the embryo, this layer is called the ectoderm.

大家知道，耳朵发育的早期特征,是胚胎外层膜的增厚，这层膜也叫外胚层。

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