夹杂物浓度和数量密度具有相似的空间分布；

The inclusion number density and concentration have the similar distribution in the RH degasser.

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我们核对检验了最为人们熟知的宽吻海豚在地中海里的数量密度。

We were checking up on the highest known density of bottlenose dolphins in the Mediterranean Sea.

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中文摘要在生态学中估计生物数量密度时，线上穿越抽样法是一种常用的方法。

In ecology, line transect survey is one of the most widely used method to assess the biomass density.

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So what is actually going to matter is how closely that electron can penetrate to the nucleus, and what I mean by penetrate to the nucleus is is there probability density a decent amount that's very close to the nucleus.

所以实际上有关系的是,电子可以穿越至原子核有多近,我所指的穿越至原子核是,这里有一定数量的概率密度,可以距离原子核非常近。

麻省理工公开课 - 化学原理课程节选