Oligonite
[化] 菱锰铁矿
🗣️ 情景例句
He's been here for years, he should know the ins and outs of the job by now.
他在这里已经好多年，现在理应熟悉各方面的工作了。
It is my pleasure to introduce the keynote speaker for today.
我很荣幸地介绍今天的主讲人。
Were you afraid?
你害怕吗？