1. 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。
2. The tea polyphenol stimulates the salitary glands. It is why tea is thirst quenching. 
   茶叶中的多酚酶能刺激分泌唾液，这就是茶能止渴的原因。
3. To harden the surface or case of(iron or steel) by high-temperature shallow infusion of carbon followed by quenching. 
   表面渗碳硬化法通过高温条件下对碳的浅层注入并紧接冷却来使（铁或钢的）表面或外壳硬化
4. capital construction unit accounting 
   建设单位会计
5. constant speed drive unit 
   恒速传动装置

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