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Your day is ruled by minutes and seconds, but these concepts are not real in any physical sense and are nonexistent to numberless people.

你的一天被分和秒所支配，但这些概念在任何物理意义上都是不真实的，对无数人来说都是不存在的。

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youdao

These are new concepts for people who may have lived in rural areas or refugee camps all their lives.

VOA: standard.2010.07.22

This diagram here sort of allows me to walk you through some of the terminology of this stem cell development and talk about these concepts.

这张图让我能跟你们一起,走马观花地看看干细胞发展中的术语,探讨一下这些概念

耶鲁公开课 - 生物医学工程探索课程节选

for exam 2, you still need to know and understand everything you learned in exam 1, but you can put off learning it completely until we get through, at least, next Wednesday before we start maybe spending time on these concepts outside of class.

为了掌握第二次考试的内容，你仍然需要知道和理解,在第一次考试前所学的全部知识，但是你可以先放一放，等到我们进行到，至少在下周三我们可能开始不在课堂上,讲这些内容之前。

麻省理工公开课 - 化学原理课程节选

In effort to reinforce these concepts, developers are also integrating quizzes and lesson reviews into MinecraftEdu.

ENGADGET: Educators battle Eternal September by teaching digital citizenship with MinecraftEdu

Liberty and economic freedom are great ideas but in Latin America these concepts have lost weight.

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Already it is clear we cannot escape using quantum theory in all these concepts.

FORBES: Higgs Boson Discovery Has Been Confirmed