We installed a safe door upstairs just in case baby will fall down from the stairs.

我们楼上装了安全门，防止宝宝滚下楼梯。

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The loading door, fuzz collector, pollutant drainage and button collector are equipped with pneumatic safe door-lock deice. Easy to operate.

装载门、绒毛收集器、蒸馏排污门、 纽扣捕集器均配有气动安全门锁装置，轻松操作安全无忧。

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Electro-mechanical equipments: platform door, safe door and accessories, elevators, escalators, moving sidewalks, solid carport and other traffic equipments;

机电设备包括：站台屏蔽门、站台安全门及配件、电梯、扶梯、人行道梯、立体车库等交通设备；

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Then, on the morning of June 2, their safe house's door was burst open by the Zimbabwean cops.

FORBES: On The Cover/Top Stories

Leave aside the unhappy fact that, in the hue and cry, Ms Bell's 14-year-old daughter learned her mother's true identity as reporters banged at the door of their safe house.

ECONOMIST: The silence of the lambs

But I knew the only thing that would make everything right would be for her husband to walk through the door right now, safe and whole in body and mind, the same man he was when he left.

NPR: Waiting and Dreading: Families in War Time