effective velocity ratio(螺旋桨处)

例句：

1. 1. The newdesign has a more effective velocity ratio thanthe old one.
   新设计的有效速度比旧的更有效。
2. 2. The team's performancewas significantly improved due to the effective velocityratio.
   由于有效的速度比，团队的表现得到了显著提高。
3. 3. Theengineers worked hard tooptimize the machine's effectivevelocity ratio.
   工程师们努力工作，优化了机器的有效速度比。