tempering quality

例句：

1. 1.The steel was tempered to improve its strength and toughness.
   钢材经过回火处理以提高其强度和韧性。
2. 2. The engineer used the tempering process to create a stronger material.
   工程师利用回火过程制造了一种更坚固的材料。
3. 3. The company's product has a high tempering quality, which is why it sells well.
   该公司的产品具有高回火质量，这就是为什么它销售良好的原因。