The ancient Greeks had many schools of thought.
古希腊人有许多流派。
And the reason there have historically been so many different schools of thought about how to achieve wisdom is that they've focused on different components of it.
而这个原因，正是长期以来学校为了达到追求智慧这个目的，从而将焦点放在其他不同的地方。
There are many different schools of thought about where stress comes from.
有许多思想学校研究压力的来源。
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