alternative variation造句

• 7 the investigation of the thermoeconomic performance of an existing facility used for thermal fatigue experiments of aircraft canopy reveals the possibility and practicability of taking measures to improve it significantly . a piping system with alternative variation of flow temperature exists in this facility
  对一现行的飞机座舱盖热疲劳试验系统? ?即流体温度升降交替变化的管路系统，进行了热经济行为的研究，揭示出它具有潜在与可行的重大改进方向和途径。