Polyprotic acid
[化] 多元酸
🧩 词语组成解析
🗣️ 情景例句
I can't figure out why she said so.
我不能理解她为什么这样说。
The speech thrilled the crowd.
这演说使听众感到振奋。
The clouds had come down so suddenly we had no warning.
乌云突然出现，我们丝毫没有觉察。