Soap dislodges dirt and oil from the body, allowing water to wash it away.
肥皂去除身上的污垢和油脂，水就会把它冲走。
But the skin on the arms and legs doesn't contain a lot of oil, so cleaning them with soap just makes them dry.
但是胳膊和腿上的皮肤并没有很多油脂，所以用肥皂清洁只会使它们变干燥。
Instead, people should concentrate on soaping the odorous parts of the body - the armpits, buttocks, groin and feet, said Dr Mahto.
反之，人们应该集中涂肥皂于身体有异味的部位——腋窝、臀部、腹股沟和脚，马赫托博士说。
As the skin gets thinner and drier as we age, older people should use less soap to prevent flaky skin, she added.
随着年龄增长，皮肤会变得越来越薄、越来越干，老人应该少用肥皂，防止皮肤变薄，她补充道。