Percolumbic acid
[化] 过铌酸
🧩 词语组成解析
🗣️ 情景例句
I hope you don't mind my asking, but I'd like to know.
我希望你不介意我向你打听一下，我想知道。
How long have you had this pain?
疼痛多久了？
I was doing my homework and forgot the time.
我在做家庭作业，忘记了时间。