虽然癌症过去100年中已经被诊断，但是内科医生不知所措解释疾病的下列原因。
Although cancers have been diagnosed for the past 100 years, physicians were at a loss to explain the underlying causes of the disease.
虽然癌症过去100年中已经被诊断，但是内科医生不知所措解释疾病的下列原因。
Although cancers have been diagnosed for the past 100 years, physicians were at a loss to explain the underlying causes of the disease.
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