Be wise as a serpent and wary as a dove! 要像蛇一样聪明，像鸽子一样谨慎! -- Mark Twain 马克·吐温
Be wise as a serpent and wary as a dove!
要像蛇一样聪明，像鸽子一样谨慎!
-- Mark Twain 马克·吐温
