Cobaltous sulfide
[化] 硫化钴
🧩 词语组成解析
a. (正)钴的, 二价钴的\\n[建] (正)钴的, 二价钴的
n. 硫化物\\n[化] 硫化物
🗣️ 情景例句
It's five years ago.
那是五年前了。
I'll have studied English for four years next March.
到明年三月，我就学了四年的英语了。[将来完成时，表示将完成…，会做完…]
One moment we were walking along the top of a hill and now we could see no more than about thirty metres ahead of us.
一时间我们还在山顶上行走，而现在30公尺开外的地方我们都看不清了。