单词	Allen screw
释义	Allen screw noun Al·​len screw ˈa-lən-  hardware : a screw with a hexagonal socket in its head that is designed to be used with an Allen wrench Word History First Known Use 1917, in the meaning defined above
随便看	gellyes gellys gelometer gelong gels gelsemia gelsemic acid gelseminic acid gelsemiums Gelsenkirchen gelt gelts geländeläufer geländesprung gelée gem gem peg gem shell gem stick gem-fruit Gemara gemaras gemaric gemarist gemarists

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