n 替代(换，补)者(物)，代用品(物)(person or thing that acts or is used in place of another)[C][N (for)]：find a～to play in sb's place寻找一名替身代某人打球;send one's deputy as a～派副手作为代表;a sugar～食糖的代用品;a～for leather/sugar/wine 皮革/食糖/葡萄酒的代用品;a～for a baseball pitcher一名垒球替补投手;There is no～for champagne/good food/exercise. 没有能代替香槟/美食/锻炼的东西。Try to make a list of these expressions and suggest～s for them. 试着把这些词语列个表并提出他们的替换词。～players/horses 替补球员/马匹;〖同〗alternate，replacement，standby;

v(1)用……代替(替换)(put sb/sth in place of sb/sth)[T+n，T+n+prep (for)]：They didn't like potatoes，so we～d rice. 他们不喜欢土豆，所以我们换上了米饭。～walnuts for pecans in the recipe/a fake diamond for the original 以核桃代替食谱中的美洲山核桃/假钻石代替真钻石;～the better kind 以次充好;～X for Y in the equation 在方程式中用X代替Y;

(2)代替，替代(act as a substitute)[I+prep(for)]：be～ing for a teacher who is ill 正在代替一位生病的教师;Water can～for wine. 水可以代替酒。 Honey can～sugar. 蜂蜜可以代替糖。

→substi′tution n 代替;替换;取代;

【辨异】substitute与displace和replace的区别见REPLACE。