Cholesterol is a waxy substance that, among other things, provides structure to the body's cell membranes.
胆固醇是一种蜡状物质，除了其它方面功能，它还是机体细胞细胞膜的构成成分。
2
This substance is secreted from cell in the intestinal walls.
这种物质是从肠壁的细胞中分泌出来的。
3
Many physicians are still using iv injections of ozone, but it is such a reactive substance, that it reacts immediately with the cell membranes of the white and red blood cells.