i want to believe in the saying "work hard,play hard",because you have some free time to play when you finish all work you should do,that is common.people always believe your hard-working can exchange the same value fruits,but seriously,the truth is not fair,that a reason why i say,"i want to believe". now I'm just a student ,imagine in future i'll get a job,i may still have free time but at that time i may not have vigor to play anymore.because work spend all my vigor,we not are robots we will feel tired on physiological and psychological