Nitempering
气体软氮化; 氮回火
🗣️ 情景例句
What do you think of the spaceship?
你觉得那个太空船怎么样？
God! It's a hard stuff.
唔！这家伙是个硬骨头。
My aunt, Mrs flower, died three weeks ago.
我的伯母弗劳尔夫人3周前去世。