He is so close you can see his white ivory tusks and the deep lines in his gray skin.

VOA: special.2009.08.19

Its role is to move molecules around in the body so that they're available to cells everywhere within your body regardless of how close they are to your skin, and we'll talk about that.

它能将分子输送到身体各处,供体内所有的细胞使用,而无论那些细胞多么靠近体表,我们会讲到这些的

耶鲁公开课 - 生物医学工程探索课程节选

Place pieces of ice in areas where blood passageways are close to the skin.

VOA: special.2010.07.27