Hot steel is quenched to harden it.

烧热的钢放入水中冷使之坚硬。

Some physico-chemistry properties of ultrafine zinc dust produced by the process of melting vapourizing shock-cooling of metallic zinc are measured.

采用金属锌加热熔化、、冷工艺制备超细锌粉,对产品的部化能进行了测试。