Peter and his mum are at the dentist’s. 是不是省略了Clinic？
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the+职业名词或称谓名词的所有格表示一个地点，例如go to the doctor's 去医生诊所dentist’s这在英语中很常见，表示名词的所属，你这样理解也可以，比如 理发师 barber's
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