想要皮肤不起皱纹的先决条件，即是要尽量避免使皮肤粗糙。
Want to wrinkle the skin can not afford a prerequisite, that is to try to avoid rough skin.
风沙的气候使她的皮肤粗糙了。
这些鳞屑使鲨鱼的皮肤变得异常粗糙，带有类似砂纸的纹理，而且非常强韧。
The scales give shark skin a very rough, sandpaper-like texture, make it very strong.
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