substitute和replace的区别

substitute是替代的意思。但一般不比原物更好，属于原物的替代品。

replace是替换的意思。跟原物的不比较，也就是说可好可差。

例句

Desserts can be substituted by a portion of fresh fruit

餐后甜点可以用一份新鲜水果代替。

Nothing can substitute for the advice your doctor is able to give you.

大夫所能给你的忠告是无可替代的。

The new design will eventually replace all existing models.

新的设计最终将会取代所有现有的型号。

Teachers will never be replaced by computers in the classroom.

课堂上电脑永远不会取代老师。