VOA慢速英语:美国癌症死亡率创有史以来最大单年降幅

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surgery – n. medical treatment in which a doctor cuts into someone's body in order to repair or remove damaged or diseased parts

scan – v. to look at the inside of (something) by using a special machine

immune system – n. the system that protects your body from diseases and infections

hepatitis – n. a serious disease of the liver that causes fever and makes your skin and eyes yellow