Sulfinuzing
氮硫化(一种钢材盐浴表面硬化法)
🗣️ 情景例句
Before you leave--do I look all right?
在你们离开之前， 告诉我， 我这样子可以吗？
Why was only he exempted from work?
为什么只有他不必工作呢？
She has been helping her husband for thirty years now.
她已经帮了她的丈夫30年了。