Throwastoneacrossthewaterandseehowmanytimesitskips(跳).Haveyouplayedthisgamebefore?Themoretimesthestoneskipsthemorecheersyouwillget.Butdoyouknowthesecretbehinditssuccess?
Withthehelpofhigh-speedcamerasscientistsatBrighamYoungUniversityintheUShavefoundoutthesecretskillsofstoneskipping.
Thefirststepistochoosetherightstone."Useflatroundstones(disc-shapedstones)andfindaweightthatallowsyoutoputalotofspinonthem"TaddTruscottanassistantprofessortoldTheHuffingtonPost.Discsareusuallyeasiertoskipthanroundedstones.
Thenherecomesthekeypart:findtherightangle.AccordingtotheGuinnessWorldRecordstheworldrecordforstoneskippingis88skipssetin2013byanAmericancalledKurtSteiner.
ProfessorTruscottsaidtheskilldependsonwhatanglethethrowerchoosestothrowastoneat.Thebestanglefordiscshapedstonesiscloseto20degrees(度).Buttheheavierthestoneistheflatterthisangleshouldbe.
Ifyoufind20degreeshardtomeasureyoucantryanotherway.Giveagreatdealofbackspin(下旋)toaroundedstonesoitwillgounderthewaterandthenpopupandoutofthewater.
"TomakeityouneedtothrowthestoneatamuchhigheranglethanfortheusualskippingMTruscottsaidtoTheHuffingtonPost.
71.Whatisthearticlemainlyabout?
Itismainlyabout____.
72.Howdidscientistsfindoutthesecretskillsofstoneskipping?
Theyfoundoutthem____.
73.Whatarethesecretskills?
Theyare____.
74.WhoisKurtSteineraccordingtothearticle?
HeisanAmericanwhoset____in2013.
75.Whatisthebestanglefordisc-shapedstones?
Thebestangleis____.