tempering bin

例句：

1. 1. The engineer used the tempering bin to heat up the steel before it was machined.
   工程师使用回火箱加热钢材，以便在加工前使其硬化。
2. 2.The manufacturer uses a tempering bin to control the temperature of the metal during the manufacturing process.
   制造商使用一个回火箱来控制金属的加工温度。
3. 3.The company has invested in a new tempering bin to improve its product quality and efficiency.
   该公司投资了一个新的回火箱，以提高其产品质量和效率。