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"Medical certificate" 或 "Doctor's certificate" 是通常用来描述由医生开具的证明文件的英文表达。这类证明文件通常是在病人需要证明自己生病或有某种健康问题时由医生开具的。它可能用于请假，申请医疗报销或其他相关用途。
例如:
I need to provide a medical certificate to my employer to prove that I was sick and unable to come to work.
Please bring a doctor's certificate to the insurance company to claim for your medical expenses.
I'm submitting this medical certificate to the school to excuse my child's absence due to illness.
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