Copperiioxide
[化] 氧化铜
🗣️ 情景例句
It's an album of pictures of the United States:
是关于美国的
We must make it clear from the very beginning that competitive quotations are acceptable.
必须一开始就讲清的是，有竞争力的报价可以接受。
Knowledge is power.
知识就是力量。