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	protanopes protanopias protanopic protargentum protargin protargol protarsal protarsi protarsus protases protasis protaspid protaspides protaspis protatic protaxial protaxis prote- protea protea veld Proteaceae proteaceaes proteaceous Proteales protealeses

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