When terrorists plant a bomb on a commercial flight, the passengers aboard the plane must fight to keep the plane in the air and all the passengers alive: the bomb is rigged to detonate whenever the plane dips below 800 feet. 　　译文(2): 当恐怖分子在商业航班上安放炸弹时，飞机上的乘客必须奋力保持飞机在空中，所有乘客都要活着: 炸弹被安装在飞机下降到800英尺以下时就会引爆。