to be on automatic pilot
1.plane +使用自动驾驶仪
It was flying on automatic pilot when the mid-air incident occurred.空中事故发生时, 飞机正由自动驾驶仪操纵。
2.<非正式>person +自然而然;习惯成自然
You've made that same trip so many times before that you're on automatic pilot.这趟旅程你已走过多遍, 早已习惯成自然了。