基于振动系统质量周期法，设计了一种测试发动机质量参数的双簧倒立摆试验台。

Based on the mass-period method, a measuring device named double spring inversion pendulum was designed, which could measure the center of mass and moment of inertia of an engine.

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例如在元素周期表中，碲排在碘之前，尽管它的原子质量略大一些。

For example, tellurium comes before iodine in the periodic table, even though its atomic mass is slightly greater.

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事实上，后来的研究已经证明，在元素周期表中，元素不应该严格按照原子质量来排序。

In fact, subsequent work has shown that in a periodic table, elements should not be ordered strictly by atomic mass.

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We have a table of the elements with properties varying periodically with atomic mass, so we compress all of that information and refer to it as the Periodic Table.

我们有一个元素表，其中的元素的特性,随着原子质量的改变而引起周期性的变化，所以我们将所有的信息精简,将它变成一个周期表。

麻省理工公开课 - 固态化学导论课程节选

And so you can look, for example, at the Periodic Table And, if you look up the atomic mass of carbon, 011 you will see that carbon comes at 12.011 for carbon.

如你们所见，例如，在周期表中,如果你观察碳的原子质量，你会看到是12。

麻省理工公开课 - 固态化学导论课程节选