单词	cycloaddition
释义	cycloaddition noun cy·​clo·​ad·​di·​tion ˌsī-(ˌ)klō-ə-ˈdi-shən  : a chemical reaction leading to ring formation in a compound Word History First Known Use 1963, in the meaning defined above
随便看	hounce hound hound band hound color hound dog hound music hound's-tongue hound's-tooth hound-marked hounded hounder hounders houndfish hounding houndish houndman houndmen hounds houndsbane houndsberry houndsfoot houndshark houndstooth houndy Hounslow

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