threshold speed

例句：

1. 1.The vehicle's threshold speed is 60 miles per hour.
   这辆车的门槛速度是每小时60英里。
2. 2. The research team has identified the threshold speed for this new material.
   研究团队已经确定了这种新材料的门槛速度。
3. 3. The aircraft must reach its threshold speed before it can take off.
   飞机必须在起飞前达到其门槛速度。