Surfactants are chemicals that make it easier for water and oil to mix. Those created artificially are called synthetic surfactants. Since milky lotions and creams are made by mixing water and oil, many cosmetics product use synthetic surfactants. An important characteristic of synthetic surfactants is their strong skin permeating abilities. However, the problem is that these chemicals are not very good for the skin.
表面活性剂是一种能让水和油更容易相溶的化学物质。人工制造出来的则被称为合成表面活性剂。由于乳液和面霜是将水和油融合制成的，因此很多化妆品生产商都是用合成表面活性剂。它的重要性质之一就是具有很强的渗透皮肤的能力。但是，问题是这种化学物质对于皮肤并不是完全无害的。
