center line of flow path

例句：

1. 1. The engineer drew a diagram to illustrate the center line of the flow path.
   工程师绘制了一幅图来说明流道中心线的。
2. 2. The new design aims to optimize the center line of the flow path for better efficiency.
   新设计旨在优化流道中心线，以提高效率。
3. 3. The research focused on finding the optimal center line of the flow path for minimizing energy consumption.
   研究专注于找到最优的流道中心线，以最小化能源消耗。