We look at soil chemistry—for example, how much nitrogen or magnesium there is in the soil in one spot—and we compare it with the chemistry of the soil a short distance away.

我们会观察土壤的化学性质——比如某个地方的土壤里有多少氮或者镁——然后与附近土壤的化学性质作比较。

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To compare the compositions of a meteorite and the Sun, it is necessary that we use ratios of elements rather than simply the abundances of atoms.

为了比较陨石和太阳的成分，我们需要利用元素的比率，而不单单是原子的丰度。

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Consider the response to the sharpness of a lemon and compare that with the face that is welcoming the smooth wonder of chocolate.

想象一下人们对柠檬刺激性气味的反应，并将其与人们享受巧克力丝滑口感的表情进行比较。

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So let's compare what some of the similarities and differences are between hydrogen atom orbitals, which we spent a lot of time studying, and now these one electron orbital approximations for these multi-electron atoms.

很长时间的氢原子轨道和,现在多电子原子中,的单个电子轨道近似，我们可以对比，它们之间,的相似性和不同。

麻省理工公开课 - 化学原理课程节选

So, what this lets us do now is directly compare, for example, the strength of a bond in terms of a hydrogen atom and hydrogen molecule, compared to any kind of molecule that we want to graph on top of it.

因此，这让我们现在可以做到直接进行比较，比如，将一个氢原子，和一个氢分子的键的强度，与任何其它类型的分子进行比较,我们只需要把它的曲线也画在这幅图上。

麻省理工公开课 - 化学原理课程节选

So one of the things I want you to notice here is that testing and debugging are not the same thing. When we test, we compare an input output pair to a specification.

这里我想大家注意的一件事,就是测试和调试是不同的两件事情,我们测试的时候，我们把输入输出,跟程序的规格说明书对比下。

麻省理工公开课 - 计算机科学及编程导论课程节选

Thankfully, in a rare move, the federal government has stepped in to compare the effectiveness of the expensive Drug A and the cheaper Drug B in a national trial.

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Create a masterpiece, and post it to the public gallery, compare a drawing with other people and post the finished drawing to Facebook.

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The development would then build a database of its canine residents and could compare poop found in verboten places with the master list and identify the culprit, a la the OJ trial or way too many TV crime shows to count.

FORBES: Is DNA Testing Of Dog Poop Forensic Science Gone Too Far?