一代毒理学家和皮肤病学家已经在整个他们的头班参考这卷，在它内找到大量理论和实际的指导。
A generation of toxicologists and dermatologists has consulted this volume throughout their careers, finding within it a wealth of theoretical and practical guidance.
提高到7班以上的膜材料最典型的方式，让皮肤看起来像它具有砂纸纹理。
Raising it to 7 goes way over the top for typical film material, and makes skin look like it has the texture of sandpaper .
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