hardening agent的用法和样例：
例句
- Plasticizing and hardening agents that can be used to alter the rheology of the phases in order to meet these constraints are also described.
对可用来改变相流变性以满足这些限制条件的增塑剂和硬化剂也作了描述。 - Some specific values of cooling characteristics of quenchant can be used to forecast the steel hardening power, distortion and cracking susceptibility and select the quenchants.
根据淬火介质冷却特性曲线上的几个特性值，选择淬火介质来预测钢淬硬能力和淬火变形开裂倾向，对提高零件质量有重要的实际意义。
