“useless work”造句，怎麼用useless work造句

Pipeline pumps are increasingly doing useless work with the decrease of annual throughput in Renqiu-Beijing Oil Pipeline.

From the viewpoint of efficiency, the energy of cardiac murmur corresponds to useless work.

Management of Yidelong : Speaking with numbers , equivocal report , account and study are nonsense and useless work , only action can prove all .