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Therearemanyusefulinventionsintheworld. Haveyoueverwis...
问题详情: Therearemanyusefulinventionsintheworld. Haveyoueverwishedtohaveanumbrellathatmakesyourhandsfree?AlanKaufmanhasthoughtupthe“Nubrella”,whichmeans“new”+”umbrella”isthefirsttrulyhands-fre...