单词	Allen screw
释义	Allen screwAllen screw /ˈælən skruː/ noun [countable] a type of screw with a hole that has six sides
随便看	preoperative preordained pre-owned prep prep. prepackaged prepacked prepaid preparation preparatory preparatory school prepare prepared preparedness prepay pre-pay prepayment preponderance preponderant preponderantly preponderate preposition prepositional prepositional phrase prepossessing

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