Precarburization
预先碳化[渗碳]
🗣️ 情景例句
You seem to have some reservations.
看起来你还有些犹豫。
Try not to be so timid when you speak.
你讲话的时候不要那么紧张。
What a good, kind girl!
多美丽、善良的姑娘！