But then, a single passenger can become a security hazard if he starts to play with the doors, tries to force his way into the cockpit or secretly smokes a cigarette in the toilet.

• 但是然后，如果他开始和门玩，一位单身的乘客能变成安全危险,试着强迫他的方法进驾驶员座舱之内或秘密地在厕所中吸烟一根香烟。