meat and potatoes不是“肉和土豆”！真正的意思是最基本的部分;最必要的部分。

【例句】
What they want is the meat and potatoes of how we're going to improve this country and get our country moving again.
他们想知道的是我们如何改善国家、让其恢复活力的基本方法。

Business administration is the meat and potatoes of business school, or what most schools call the core curriculum.
工商管理是商学院的基本学科，很多商学院视之为核心课程。