Automatic doors may seem simple, but they are not.

自动门看起来很简单，可事实却不是。

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The tour bus has automatic doors that only open when the bus is stationary.

游览车的自动门只有在车辆静止不动的状态才能打开。

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The doors to the department store are automatic.

百货商店的门是自动的。

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The doors to the department store are automatic.

百货商店的门是自动的。

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