working substance的用法和样例：
例句
- The relation between the optimal efficiency and power output of the engines for an ideal or van der Waals gas as a working fluid is derived.
导出这类热机以理想气体或范德瓦耳斯气体为工质时的最佳效率与输出功率间的关系。 - To take advantage of the temperature glide matching of working substances and heat resources is an very importment reason of using non-azeotropic refrigerants.
选用非共沸工质的一个重要原因是为了利用其温度滑移特性以匹配热源流体的温度变化，减少换热过程的不可逆性。
