additive
/ˈædətɪv/📚 15726 73 1托福An additive is a substance which is added in small amounts to foods or other things in order to improve them or to make them last longer. 添加剂
noun [具体名词]添加剂，添加物
I think, though, that even in the USA, ethanol is still only used as an additive to gasoline, or petrol.不过我认为，即使在美国，乙醇仍然只用作汽油的添加剂。
adjective [原级]累积的，添加的；（与）叠加色（有关）的
Some contain more than one additive.有些含有不只一种添加剂。
单词造句: