英文翻译：A la carte is a mean in which each item is priced and charged seperately.

这句子有语法错误,
应该是
A la carte means each item is priced and charged seperately.
或
A la carte is a means by which each item is priced and charged seperately.
如你所说
法语 a la carte 就是 with a separate price for each item on the menu ,
句子大致是说
a la carte 是说菜单上每个菜分别计算收钱书上写的呀，而且老师没说有错。。。同学，书本也会有错，这句子错在means （方法，办法，工具） 用复数形式，而且 a means of 和 a means by which 是固定搭配。（我是加拿大人，英语是我第一语言，我曾是英语老师。）尽管如此，你的提问我回答了，满意请采纳，谢谢。