无以为报 無以為報

    wúyǐwéibào

    1. Idiomunable to return the favor

    你帮了我这么大的忙,我真是无以为报。Nǐ bāng le wǒ zhème dà de máng, wǒ zhēnshi wúyǐwéibào.I truly don't know how to repay you for your great help.