Precarburization
预先碳化[渗碳]
🗣️ 情景例句
What are you working on?
你在干什么？
That's very nice of you. I guess I could use some help.
谢谢你的好意。我想我可能要一点帮助。
Shortly afterwards, the police stopped the car and both men were arrested.
没过多久，警察就截住了那辆车，两个小偷都被抓住了。