hardening agent的用法和樣例：
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.
對可用來改變相流變性以滿足這些限制條件的增塑劑和硬化劑也作了描述。 - 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.
根據淬火介質冷卻特性曲線上的幾個特性值，選擇淬火介質來預測鋼淬硬能力和淬火變形開裂傾向，對提高零件質量有重要的實際意義。
