mores.Second,they may indulge in it,thus dilapidate their study,which isn't rare.Third,some just take advantage of it to kill time,avoid boredom with much time at their own disposals,have someone keep company,etc.What's more,some change dating "partners" frequently,holding a paradox opinion that they could show off their charm or accumulate experience,but more often than not,they would leave a bad impression,such as lacking the sense of responsibility,on others,especially their former sweethearts.Last,the proportion of successful couples is too low.The overwhelming majority reach the same end-parting just before graduatio