trunkback

例句：

1. 1.The team decided to take a retrograde approach to the problem.
   团队决定采取一种倒退的方法来解决这个问题。
2. 2. The car's engine has started to retract, and it won't start again.
   汽车的引擎开始倒退，而且不会再启动了。
3. 3. As the sun set, the clouds began to recede.
   随着太阳落山，云层开始退去。