单词	alkylidene
释义	alkylidene noun al·​kyl·​i·​dene alˈkiləˌdēn plural -s : a bivalent aliphatic radical (such as ethylidene) derived from an alkane by removal of two hydrogen atoms from the same carbon atom Word History Etymology International Scientific Vocabulary alkyl + -idene First Known Use 1900, in the meaning defined above
随便看	subway subway train subwayed subwaying subways subweight subwoofer subwoofers subworld subworlds subwriter subwriters subxerophilous subzero subzone subzones suc succ succade succades succah succahs succedanea succedaneous succedaneum

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