combined recycle的用法和样例：
例句
- The paper introduces the technical features of heat and poer coneneration and combined cycle power generation systems using natural gas as fuel.
介绍了天然气做燃料的热电联产和联合循环发电系统的技术特征，根据总能系统原理梯级利用天然气燃料所产生的能量，达到较高的综合热效率。 - Some key technical problems and its solutions were presented for gas-fired combined cycle power plant using LPG as main fuel.
给出了以液化石油气作为主燃料的燃气轮机联合循环发电厂的一些技术问题的解决办法。
