constant volume line

例句：

1. 1.The constant volume line is a critical part of the design process.
   恒定体积线是设计过程的一个关键部分。
2. 2. In the study of gas dynamics, the constant volume line is used to determine the speed of sound.
   在气体动力学研究中，恒定体积线用于确定声速。
3. 3.The constant volume line divides the fluid into two regions: the region above and below the line.
   恒定体积线将流体分为两个区域：线上方和线下方。