returning fluid造句

According to a series of experimental data , the effect of following factors on the temperature in the ultra - low temperature box and cop are analyzed : the mixture composition , the pressure ratio and the return fluid extraction ratio of the rectifying column , the refrigeration capacity and the flow rate through throttle valve
并根据一系列实验结果，分析了工质配比、循环压比及精馏柱回流液的抽取率、加热量和节流元件对低温箱内温度和系统cop的影响，为今后的进一步研究指明了方向。
It's difficult to find returning fluid in a sentence. 用returning fluid造句挺难的