additive
/ˈædɪtɪv; `ædətɪv/ n
substance added in small amounts for a special purpose 为某目的而加进的少量 物质; 添加剂
chemical additives in food 食品中的化学添加剂
food additives, ie to add colour or flavour to the food or to preserve it 食品添加剂（用以增加食物的颜色或味道或使之防腐）. additive, adj involving addition 添加的; 附加的.