n.熄灭；抑制
动词quench的现在分词形式.
Hot steel is quenched to harden it. 烧热的钢淬火使它坚硬。
The fire quenched. 火熄灭了。
So we find that hardening operation is made up of heating and quenching. 因此我们发现淬火工序包括加热和淬硬两个步骤。
