it is (u ) to keep working so hard,it doesn't work at all

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itis(u)tokeepworkingsohard,itdoesn''tworkatallitis(u)tokeepworkingsohard,itdoesn''tworkatallitis(u)tok

it is (u ) to keep working so hard,it doesn't work at all
it is (u ) to keep working so hard,it doesn't work at all

it is (u ) to keep working so hard,it doesn't work at all
useless
无用的,没用的.
不停地努力工作毫无用处,因为它根本就不能工作.