Polyprotic acid
[化] 多元酸
🧩 词语组成解析
🗣️ 情景例句
Is it finished yet?
行了吗？
A friend is best found in adversity.
患难见真友。
We are lucky in that only the lower fields, which make up a very small proportion of our farm, are effected by flooding,
值得庆幸的是，只有低洼的受到洪水影响，而低洼地在我们农场比例很小。