Nitrocarburizing
气体碳氮共渗; 渗碳氮化
🗣️ 情景例句
I need to be in the top percentage of my class to study abroad.
为出国留学，我的成绩必须在班里名列前茅。
You look very serious about something.
你似乎有很严重的事。
Why are you in here?
你为什么在这里呢？