盐于5,000多年前作为一种简单的防腐剂开始应用。
Salt started out more than 5, 000 years ago as a simple preservative.
这次研究中，他们用了两种混有多种食品添加剂的饮料，以及一种未添加任何色素或防腐剂而只是作为安慰剂的饮料。
Their study also used two different cocktails of additives as well as a placebo drink that contained no food colourings or preservatives.
盐于5,000多年前作为一种简单的防腐剂开始应用。
Salt started out more than 5,000 years ago as a simple preservative.
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