suān - acid; sour; ache

A good science word (for example, it is part of DNA), but one that also can be used in an everyday context. I picked it today because I was adding acid (benzoate - 苯甲酸 and acetate - 乙酸盐) to cells in an attempt to induce calcium influx. I also like the word for the sentence below as I have some sour green apples from Victoria.

未成熟的苹果是酸的。
Green apples are sour.

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