working substance的用法和樣例：
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.
導出這類熱機以理想氣體或范德瓦耳斯氣體為工質時的最佳效率與輸出功率間的關係。 - To take advantage of the temperature glide matching of working substances and heat resources is an very importment reason of using non-azeotropic refrigerants.
選用非共沸工質的一個重要原因是為了利用其溫度滑移特性以匹配熱源流體的溫度變化，減少換熱過程的不可逆性。
