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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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。

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For DNA, these units are the c, t, a and G bases, and for proteins the units are 20 different amino acids.

对DNA来说，这些单位是C、T、A和G碱基，对蛋白质来说这些单位是20个不同的氨基酸。

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

ECONOMIST: Monitor