This is a simple and really impressive use of household acids and bases that can be made again and again.

这个很简单，也很有意思。它需要一些家用酸和基本材料，这些都可以被反复利用。

youdao

If you took more advanced chemistry, you might have learned that bases are substances that can donate electron pairs, and that acids are substances that can accept them.

如果你进一步的学习了高等化学，那么你可能会知道，碱是指可以给出电子对的物质，而酸则是指可以接收电子对的物质。

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DNA also has this sort of combinatorial system where you have a finite number of, I guess, bases or amino acids that could combine to a possible infinity of strings of DNA strings.

脱氧核糖核酸也拥有这种组合系统，你的生物基础或氨基酸数量是有限的，但却能组合出，几乎无限的脱氧核糖核酸螺旋结构。

youdao

DNA also has this sort of combinatorial system where you have a finite number of, I guess, bases or amino acids that could combine to a possible infinity of strings of DNA strings.

脱氧核糖核酸也拥有这种组合系统,你的生物基础或氨基酸数量是有限的,但却能组合出,几乎无限的脱氧核糖核酸螺旋结构

耶鲁公开课 - 心理学导论课程节选

Then they tested its ability to repel water, acids and bases.

ECONOMIST: Monitor