单词	hardhack
释义	hardhack noun hard·​hack ˈhärd-ˌhak  : a North American spirea (Spiraea tomentosa) with dense terminal panicles of pink or occasionally white flowers and leaves having a hairy and yellow to rust-colored underside Word History First Known Use 1814, in the meaning defined above
随便看	hydroturbine hydrotype hydrous hydrouser hydrousest hydrousser hydroussest hydrovane hydrovanes hydroxamic acid hydroxamino- hydroxide hydroxides hydroximino- hydroxo- hydroxonium hydroxy hydroxy acid hydroxy amine hydroxy ketone hydroxyamino- hydroxyapatite hydroxyapatites hydroxybenzenes hydroxybutyric acid

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