快速渗透溶解刹车零件，离合器上的杂质，粉尘和油污；

Instantly penetrate into the dissolved brake parts, clutch of impurities, dust and oil;

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问题在于这种溶解足够快而造成深层渗透，并形成了长距离洞穴系统。

The question is how that dissolution can happen fast enough to produce deep penetration and allow long cave systems to form.

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黄金不常用在皮肤的疗程中因为它非常难溶解并渗透于我们的皮肤。

Gold is not commonly used for skin treatments because it is very difficult to dissolve and penetrate the skin.

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Now, sodium and potassium don't ordinarily move across membranes, they're charged molecules, they can't dissolve, they can't permeate through a cell membrane, but they go through because there are channels that allow them to pass through in the membrane.

钠和钾通常是不能跨过细胞膜的,它们都是带电粒子,它们不能溶解在细胞膜中,不能渗透通过细胞膜,但它们之所以能通过细胞膜,全赖膜上离子通道的作用

耶鲁公开课 - 生物医学工程探索课程节选