He could not show the certificate from a doctor about his sickness.

他也没法出示生病的医生证明书。

youdao

We will no longer accept a doctor's certificate as proof of sickness. If you are able to go to the doctor, you are able to come to work.

我们不再需要医生出具的病历证明。如果你能够去看医生，你也能来工作。

youdao