You must see a doctor, Frederick.
弗雷德里克，你一定得看医生。
You must see a doctor if you are ill.
如果你生病了，就必须去看医生。
你一定得去看医生。
You must see a doctor immediately if you experience these symptoms.
如果有这些症状需要马上看医生。
You must see your doctor for a thorough examination.
你必须去看医生，做个全面体检。
You must go to see a doctor in case of illness.
倘使生病了，你必须去看医生。
你一定要去看医生。
You must go to see a doctor when you do not feel well.
当你感觉不舒服时，你要去看医生。
You must go to see a doctor when you do not feel well.
当你感觉不舒服时，你要去看医生。
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