cruise relief autopilot

例句：

1. 1.The cruise control system on my car is very easy to use.
   我车上的巡航控制系统使用起来非常简便。
2. 2. The pilot used the cruise control system to maintain a steady speed.
   飞行员使用了巡航控制系统来保持恒定的速度。
3. 3.The cruise control system was designed to help passengers relax during long flights.
   巡航控制系统被设计用来帮助乘客在长时间的飞行中放松。