它们通过空气或经由与皮肤的接触进入人体。
They enter the body through the air or on contact with the skin.
他们发现那与梅毒性质最靠近的是南美洲变体，一种精经由皮肤接触和热及潮湿区域传布的疾病。
They found that syphilis's closest kin were South American variants of yaws , a disease spread by skin contact and limited to hot and humid areas.
多数手术处置是经由切割皮肤以允许外科医师处理较深的组织或器官。
Most surgical procedures involve a cut in the skin that allows the surgeon to gain access to the deeper tissues or organs.
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