youdao

But because of gravity's negative energy, it doesn't matter how small such holes are: they still have the potential to inflate and expand in their own dimensions (rather than gobbling up our own).

但是由于重力存在负能量，这些黑洞有多小也无关紧要：它们仍然有潜力在它们自己的维度中膨胀并扩展(而不是吞噬它们自身)。

youdao

Remember that depending upon how you define your zero level here, you also end up with negative values for potential energy.

记住这个值取决于，你怎么定义0水平，你的得到的势能，也是负值。

youdao

At infinity, there's no stored potential energy, and it drops off more and more negative as one over R.

在无限远处，没有储存的势能，并且它向负方向减少，当距离超过R时。

麻省理工公开课 - 固态化学导论课程节选