barotropic gas的用法和样例：
例句
- In actual practice, a constant-volume gas thermometer is more convenient to use than a constantpressure one.
在实践中，用恒体积的气体温度计比用恒压气体温度计更方便。 - The design principles and the optimum range of the new aerodynamic foil journal bearing with elastic support and self-acting gas bearing cryogenic turboexpander were obtained.
归纳总结了弹性支承箔片动压气体径向轴承的性能特点和最优设计原则，并提出了全动压透平膨胀机的设计准则。
