土壤和能渗透的岩石中含有的地下的水。
Underground water that is held in the soil and in pervious rocks.
所以你能逐步积累起较高的压强，那就叫做渗透压。
So you can build up some high pressure, what's called osmotic pressure.
而铁元素在我们的细胞中产生一种具有破坏性的，能渗透进细胞膜和DNA并老化细胞的物质的过程中扮演着重要的角色。
Iron plays a very important part in the reactions in our cells that produce damaging free radicals, which glom onto cell membranes and DNA, and may translate into aging the cell.
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