doortrap
自动关门器 automatic door closer
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我曾用水泥填充的轮胎、雨伞和锡箔以及报警器制作了一个自动关门器。
I'd invented an automatic gate closer out of cement-filled tires, a solar cooker that didn't work very well out of an umbrella and tinfoil, baking-pan alarms to entrap my siblings.
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