紧急出口警报器（EDM）只有在紧急出口门已关闭和上锁时才允许启动发动机。
The Emergency Door Module (EDM) allows the engine to be started only when the emergency exit door is closed and unlocked.
在计数阶段的最后，主控门关闭，然后计数器复位，开始下一个采样阶段。
At the end of the counting period, the main gate is closed and counter reset for the next sampling period.
典型的电梯门上有一个定时器，其作用是当没人进入电梯且按下去其它楼层的按钮时可自动关闭电梯门。
The door on a typical elevator has a timer on it which closes the door automatically if no one enters the elevator and pushes a button for another floor.
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