freeadj.自由的；免费的；畅通的；没有…的；未使用的；空闲的；随意的v.释放；使自由；使摆脱；解除；使可用于(某目的)adv.免费地；自由地free pupa裸蛹,离蛹

1. Investigators found that the pilot's teenage son had been allowed to enter the flight cabin and had accidentally switched off the autopilot.
   调查人员发现，上次事故的原因是由于飞行员的小孩在获准进入飞行舱后意外关掉了自动导航仪所致。