Pentoxide
n. [化]五氧化物
🗣️ 情景例句
We've got permission to go inside the old building
我们已获 进入那栋老建筑物
If the sky falls,we shall catch larks.
天垮正好抓云雀；不要杞人忧天。
The problem now facing humanity is: What is going to be done with all this knowledge?
用这些知识去做什么？