"A needle that goes through the skin needs to be as sharp as possible because that's going to be associated with the easiest access, the more slick closure, and the less pain when somebody has, say their blood drawn or their skin closed."

VOA: special.2010.02.10

And this is what's characteristic of smallpox, is that as the virus spreads through your body, it particularly, it particularly affects cells of your skin.

这是天花的特征,当病毒传遍全身时,它特别的,特别地作用于皮肤细胞

耶鲁公开课 - 生物医学工程探索课程节选

Water vapor goes through my skin.

水蒸气会穿过我的皮肤。

麻省理工公开课 - 热力学与动力学课程节选

It's the vitamin associated with the sun that we absorb through our skin, and increasingly block out when we use sunblock, to avoid getting skin cancer.

VOA: standard.2010.05.28