在这里，外部不是指皮肤(皮肤过于干燥不适合微生物生存)。
In this context, the outside is not the skin: that is dry and hostile to germs.
腠理指皮肤、肌肉的纹理，以及皮肤与肌肉之间的间隙。
Striae refers to the natural lines of the skin and muscles, and the Spaces between the skin and muscles.
科研人员称，其中最重要的因素是水合，指皮肤吸收水分、保持湿度的过程。
The team believes one of the most important factors is hydration - the way skin collects and retains moisture.
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