Lecithin, as a kind of important physiological activator and natural surface active agent, offers many advantages to health, and is widely used in the fields of food, pharmacy and cosmetic.

卵磷脂是重要的生理活性物质，也是一类天然的表面活性剂，广泛应用于食品、医药、化妆品等行业。

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The surface of material is very important for us to use it, while the (001) surface of lead salts is a natural surface.

由于表面对材料的特性具有重要的影响，而（001）表面是铅盐的天然解理面，所以对铅盐（001）表面的研究具有至关重要的意义。

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The natural surface active substance obtained from the sapindus mukorssi contains terpenoid, steroid saponin, amine acid, protein, vitamin, oleic acid, oil and so on.

从无患子中提取出天然表面活性物质。该表面活性物质中含有萜类甾体皂甙及氨基酸、蛋白质、维生素、油酸、油脂等。

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Once preserved the bodies are highly durable, but still retain the natural surface structure.

BBC: NEWS | Health | Preserved body slice on display

The islands natural surface and ground-water resources can only cover about 10% of the demand at present.

UNESCO: MEDIA SERVICES

"We're finding that when you rub a natural biological surface that has an orientation - that has a grain, if you will - and you run that grain perpendicularly to the long axis of the ridges, we find a dramatic increase in friction, " Dr Dominy told BBC News.

BBC: Artificial finger tests evolutionary origin of prints