在我们的星系中，超过10亿颗恒星已经耗尽了它们的内部能量来源，因此无法再产生恒星所需的热量来对抗向内的引力。

Upwards of a billion stars in our galaxy have burnt up their internal energy sources, and so can no longer produce the heat a star needs to oppose the inward force of gravity.

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一些人把石头带回家，然后用已经创作并藏起来的新石头来替代它们。

Some take the rocks home and then replace them with new ones that they created and hid.

youdao

然而即使这些图象已经得到，再从它们来绘制出草图又是另一回事。

Even when the images are in, however, making a map from them is another matter.

youdao

Let me cluster them because really what I have, sorry, separate them out. I've gone from one problem size eight down to eight problems of size one.

让我把它们聚集起来，因为已经得到我想要的，抱歉，把它们分开来,现在我从一个长度为8的问题,得到了八个长度为1的问题。

麻省理工公开课 - 计算机科学及编程导论课程节选

So basically, at the time he was just going on size and then traits, but what we actually know today is that we can also order things in the periodic table by electron configuration.

基本上，在当时他只能通过大小,和特性来进行，但是现在我们已经知道了,我们还可以通过电子排布来对它们进行排序。

麻省理工公开课 - 化学原理课程节选