Whenfacingwithvariouscomplicatedphenomenonintheworld,inmostcasespeopletendtoconcernmoreaboutwhatappearstofloatonthesurfaceofwaterratherthantoemphasizeinsomethinghiddenbehindthewall.Directthougheyesightis,criticalanalysesinmindcometobethekeyelementforthetruthofanyissuesinhistoricalrivers.