they work hard,but their efforts are not very p------

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theyworkhard,buttheireffortsarenotveryp------theyworkhard,buttheireffortsarenotveryp------theyworkha

they work hard,but their efforts are not very p------
they work hard,but their efforts are not very p------

they work hard,but their efforts are not very p------
They work hard ,but their efforts are not very payoff .
Payoff = 取得好成绩 ,得到好结果.