[] () a statement by a doctor that sb has been ill and unable to work（关于疾病或残疾的）医学证明书◆If you are absent for longer than five days, we may require you to produce a medical certificate.如果你缺席五天以上，我们可以要求你出示医学证明书。a statement by a doctor that sb is in good health and can do a particular job健康证明书◆Pilots must hold a valid medical certificate.飞行员必须持有有效的健康证明书。