英语单词辨析 - Principal or principle

Principal or principle

ref：原文

Principal：

Principal作为形容词意味着“最重要的”：

The principal reason for the failure to take action was poor communication between government departments. (the most important reason)

我们可以将principal用作名词，指的是学校或大学的校长（尤其在美式英语中）：

The college principal made a speech congratulating all the students who were graduating in that year.

Principle：

Principle是一个名词，意思是‘解释某事物或工作方式的规则或理论’或‘道德规则或准则’：

The scientific principles behind even the most complicated computer are relatively simple.

He seems to have no principles at all, and is only interested in money. (He has no moral rules or guidelines.)