Precarburization
预先碳化[渗碳]
🗣️ 情景例句
May I speak to the head of the household?
我可以请户主听电话吗？
I bought 3 pounds of flour.
我买了三磅面粉。
A pilot noticed a balloon which seemed to be making for a Royal Air Force Station nearby.
一个飞行员发现了一只气球，它像是正飞往附近的一个皇家空军基地。