盖茨说：“即使是像分辨开着的门和窗户这样简单的事情，对机器人来说也是很棘手的。”

'Even something as simple as telling the difference between an open door and a window can be tricky for a robot,' says Gates.

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商店都打烊了，门和窗户都关了。

The stores were closed, the doors, the windows.

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门和窗户都关着，没有强行进入的迹象。

The door and the windows were all closed and there was no sign of forced entry.

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