如果是原子质量一定，而电子很小，那么带正电荷的部分几乎占据了全部质量。

If the atom is fixed mass, and the electron is tiny, it must be the positives have all the mass.

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我们向你方保证，我们货物的质量一定与样品的质量一致。

We assure you that the quality of our goods will be in accordance with that of the sample.

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总之，如果我们采取有效措施，空气质量一定可以逐步提高。

In a word, the air quality can be improved gradually if we take more effective measures.

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If the atom is fixed mass, the electron is tiny, It must be the positives have all the mass.

如果是原子质量一定，电子很小，带正电荷的部分几乎占据了全部质量。

麻省理工公开课 - 固态化学导论课程节选

But he also realized that when they did hit something what they hit what unbelievably massive but also that that mass was concentrated So eventually, this is what we have come to call the nucleus of an atom.

碰到的一定是十分重的东西,而且那些质量,要聚集在非常非常小的空间内,这个就是我们称作,原子核的东西。

麻省理工公开课 - 化学原理课程节选

And the fact is, food is healthier if it has less trans fat, but it depends on what fat's swapped out for it, because if you put a healthier fat in then it's--then you get a certain amount of improvement.

事实是,如果食物中反式脂肪的含量较低,确实会更健康,但这取决于被剔除的脂肪种类,因为如果加入较为健康的脂肪,食物的质量会获得一定程度的改善

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选