相關Chemistshavebeenstud的文學知識

問題詳情：Reading.Chemistshavebeenstudyingwhypeoplecry.Theysaythebodyproducestwokindsoftears.Onekindcleansouttheeyeifitgetsdirtinit.Butwhenpeoplecrybecauseoftheirfeelings,thesetearshavepoisonouschemical...