Precarburization
预先碳化[渗碳]
🗣️ 情景例句
He's very nice.
他很不错。
Don't let his criticisms bother you.
别因为他批评你而感到烦恼。
They finally found a small gold coin which was almost worthless.
但最后找到的是一枚几乎一钱不值的小金币。