Underhardening
欠热淬火, 低温回火处理 (用于高速钢刀具)
🗣️ 情景例句
I feel rotten about not taking the children out.
我没有带孩子出去觉得很不痛快。
The trees emit a fragrance of their own.
各种树木会发散各自独有的气味。
Thanks a million.
非常感谢。