Pentoxide
n. [化]五氧化物
🗣️ 情景例句
You don't recognize me, do you?
你不认识我了， 是吗？
I ought to see a doctoe at once.
我应该立刻去看医生。
I only have small boxes.Do you want one?
我只有小盒的。您要一盒吗？