Pentoxide
n. [化]五氧化物
🗣️ 情景例句
Thank you. Yes, actually Mary and I have been planning this for some time.
谢谢。其实玛丽和我已计划了很久。
You cannot have two forenoons in the same day.
一日之中不可能有两个上午。
Inevitably the repair job was not quite so simple.
事实上，修理工作远不是那么简单。