单词	nonfrivolous
释义	nonfrivolous adjective non·​friv·​o·​lous ˌnän-ˈfri-və-ləs  : not lacking importance, seriousness, or a sound basis : not frivolous a nonfrivolous lawsuit Word History First Known Use 1892, in the meaning defined above
随便看	tapped tapped out tapper tapper tap tapper-out tappers tappers-out tappet tappet motion tappet rod tappet wrench tappets tappietoorie tapping tapping drill tapping hole tapping key tapping out tapping screw tappings tappit hen tappoon taprobane taproom taprooms

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