通过测量光谱变化，科学家们能够确定目标分子在溶液中的浓度。

Scientists are able to determine the levels of the target molecule in solution by measuring the spectral changes.

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选择性血清胺再吸收抑制剂阻滞了血清胺的再吸收，增加了其在神经突触中的浓度。

SSRIs block serotonin re-uptake, boosting its concentration in the synapse.

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虽然在地球大气层中的浓度甚微，一氧化二氮是一种很强的温室气体，而且正成为破坏平流层臭氧的主因。

Although present in minute concentrations in Earth's atmosphere, nitrous oxide is a highly potent greenhouse gas and is becoming a keyfactor in stratospheric ozone destruction.

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For example, sodium in our blood plasma is almost to the point sometimes of 100 millimol or that's very, very concentrated.

比如，钠在我们的血浆中的浓度,有时几乎达到了一百毫克分子,或者说非常非常浓。

麻省理工公开课 - 化学原理课程节选

But when the concentration in the alloy is 50/50 by mole, something magical happens.

但是当合金中的浓度,是1比1的时候，有些神奇的事发生了。

麻省理工公开课 - 固态化学导论课程节选