Several elements are nested inside the root element, as in Listing 3.

根元素中嵌套有几个其他元素，如清单3所示。

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Listing 3 adds this element and fills in the skeleton from Listing 1.

清单3增加了该元素并填充到清单1的框架中。

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Step 3 — Assess element maturity.

步骤3——评估元素成熟度。

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So we want to look at any element that has a 3 p orbital filled, but that does not then go on and have a 4 s, because if it had the 4 s filled then we would actually see six lines in the spectrum.

所以，我们要找一找有哪些元素的,3，p，轨道被占据，但没有，4，s，轨道被占据,因为如果，4，s，轨道也被占据了,那我们会在光谱中看到第六条谱线。

麻省理工公开课 - 化学原理课程节选

For Scotland, the can't-bear-to-watch element was the 3-0 defeat against John Toshack's Wales.

BBC: Storm clouds gather over Scots

Or are Omega-3 fatty acids the it element this month?

FORBES: Weighing In On Worst Words On Diet, Exercise And Body Image

But over the 40 years as a whole, the difference between the two returns was just 0.3 percentage points the speculative element was virtually non-existent.

ECONOMIST: Buttonwood