drag·on·fly /ˈdrægənˌflaɪ/
  蜻蜓
  dragonfly
       n : slender-bodied non-stinging insect having iridescent wings
           that are outspread at rest; adults and nymphs feed on
           mosquitoes etc. [syn: darning needle, devil's darning
           needle, sewing needle, snake feeder, snake doctor,
            mosquito hawk, skeeter hawk]