Only US firefighters and repairmen can use the buttons to speed up the door-closing process if they have a code or special keys.
只有美国消防员和维修人员有密码或者特殊的钥匙时，他们才能按按钮加速关门的过程。
2
The higher the closingspeed of two aircraft heading towards each other, the bigger the PAZ required, because the pilot needs more time to react to a warning.
两架相向飞行的飞机速度越高，所要求的“保护空域”越大，因为飞行员需要更多的时间对预警做出反应。
3
Overwhelmingly, people are talking about the new iPhone's lightning fast speed, especially when opening and closing applications and browsing the net.