You know, you mix acid and base together and the thing heats up like crazy, right.

你知道，当你把酸和碱混合起来时,这东西会像疯了一样地变热。

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very, very competitive acceptance rates and, uh, you know, generally very smart student-base,

哥伦比亚的入学门槛很高，这里的学生都非常的聪明，

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She needs to know this enzyme works by both acid base chemistry, and oxidation reduction.

她要知道酶催化，她需要知道这种酶,在酸碱环境下的反应和氧化还原反应。

麻省理工公开课 - 化学原理课程节选

Francis says that before joining a social network to make sales, you must know your client base.

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As you know, many base salaries on Wall Street are eclipsed by bonuses often in the form of company stock.

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