Precarburization
预先碳化[渗碳]
🗣️ 情景例句
Are you from Taiwan?
您是从台湾来的吗？
A wonder lasts but nine days.
新鲜事儿不久长。
the mind catches hold of something and will not let it go.'
此时脑子纠缠住了某种东西又不肯松手。"