Carbusintering
渗碳烧结
🗣️ 情景例句
Yes, sir.
是的 ，先生。
It's up to date.
这个很时兴。
She does, doesn't she! I read she's twenty-nine,- but she must be at least forty.
是的，谁说不是呢！我从报上看到她是29岁，但她一定至少有40岁了。