呦呦
(literary) (onom.) bleating of a deer
悠悠
lasting for ages; long drawn out; remote in time or space; unhurried; a great number (of events); preposterous; pensive
优游自得
free and at leisure (idiom); unfettered
悠游卡
EasyCard, smartcard used for payment on public transport and at other businesses such as convenience stores in Taipei and surrounding areas
责有攸归
responsibility must lie where it belongs (idiom)