替代（tì dài）用英语可以表示为"substitute"或"replace". 替代（tì dài）这个词来自汉语，它的字面意思是"代替"，即用一种东西替换另一种东西。例如：

请用橙汁替代柠檬汁。Please use orange juice as a substitute for lemon juice.

我们可以用植物油替代动物油。We can use vegetable oil as a replacement for animal fat.

你可以用这个替代那个。You can use this one as a substitute for that one.