The human body regrows its outer layer of skin every two to four weeks, and bits and pieces of the old skin break off - to become dust.

人体皮肤外层每2至4周更新一次。老化的皮肤将会脱落，成为灰尘的一部分。

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The human body regrows its outer layer of skin every two to four weeks, and bits and pieces of the old skin break off - to become dust.

人体皮肤外层每2至4周更新一次。老化的皮肤将会脱落，成为灰尘的一部分。

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