It's the difference between opening your refrigerator door and the light is just on, versus opening your front door to find a dark apartment and then fumbling for the light switch.

这和打开冰箱门灯就会亮和打开前门发现一个黑暗的公寓然后摸索着去找电源开关的不同一样。

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Some one was opening the front door with a latchkey.

有人正用钥匙打开房子的前门。

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Opening up the door, in the light of the corridor, I found stunningly that fahter was standing in front of me!

打开寝室的门，借着楼道里暗暗的灯光，我不禁一惊，竟是父亲！

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He was said to have carried a gun with him everywhere, and was extremely cautious when opening the front door of his house, in the town of Forney just outside Dallas.

BBC: Texas district attorney third law official killed in weeks

He begins by quickly and deliberately opening the office front door and smiling as he passes a puzzled staffer.

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Willingham had fled out the front door, and the fire simply followed the ventilation path, toward the opening.

NEWYORKER: Trial by Fire