要理解这一方法，我们首先要清楚美国的大学分为三类-公立，私立和非盈利型；私立学校为了利润而经营。
To understand this, it helps to know that America has three types of university-public ones; private, not-for-profit institutions; and private schools run for profit.
其中一些方法，尤其是单元学习法、蒙特梭利和华德福，在公立或私立学校也有。
Some of these approaches, particularly unit studies, Montessori, and Waldorf, are also available in private or public school Settings.
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