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	ulcers ulema ulemas ules uletic ulex ulexes ulexine ulexite ulexites uleåborg Ulfilas ulfilas ulican ulices ulichons ulicons uliginous ulikons ulites ulitides ulitises ulitisses ulla grass ullage

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