principal 可作名词或形容词，而principle 只能做名词。
principal ['prɪnsəp(ə)l] 本金，委托人，资本，主角 ，最重要的，主要的。principle ['prɪnsəp(ə)l] 原理，原则，工作原理，法则。
双语例句:
The principal reason for my change of mind is this.
这是我改变主意的最主要原因。
Donald King is the principal of Dartmouth High School.
唐纳德·金是达特茅斯中学的校长。
Their principal concern is bound to be that of winning the next general election.
他们最关心的问题肯定是赢得下一次大选。
The students passed a motion of no-confidence in the college principal.
学生们通过了对校长进行不信任投票的动议。
Buck never allowed himself to be bullied into doing anything that went against his principles
巴克从来不会因为受到威胁而做违背自己原则的事情。
The doctrine was based on three fundamental principles.
这个学说建立在三条基本原理之上。
These people lack all understanding of scientific principles.
这些人对科学原理一窍不通。
I agree with it in principle but I doubt if it will happen in practice.
我大体上同意这一点，但是怀疑它是否能够付诸实践。
principal
adj.主要的
n.负责人,校长,资本
1.Our principal problem is lack of time.
我们的主要问题就是缺少时间.
2.My wages are the principal source of my income.
薪金是我收入的主要来源.
3.I will have to consult my principals before I can give you an answer on that.
我必须同我的委托人磋商后才能就这个问题给你答复.
4.I must consult my prinicipals before agreeing to your proposal.
我得同委托人商量后才能接受你的建议.
5.Keys are available on application to the principal.
向校长申请就可得到钥匙.
6.How much interest will there be on a principal of $5000?
5000美元本金的利息是多少?
7.The agent spoke on behalf of his principal.
代理人代表他的委托人说话.
8.My principal concern is my family's welfare.
我至为关心的是我一家的幸福.
principle
n.原则,原理,主义,信念
1.We adhere to the principle that everyone should be treated fairly.
我们必须坚持人人都应该被平等对待这一原则.
2.The system works on the principle that heat rises.
该项装置是按照热力上升的原理运转的.
3.They have agreed to the proposal in principle but we still have to negotiate the terms.
他们基本上同意了那项提议,但我们仍须商定条件.
4.These machines both work on the same principle.
这两台机器的工作原理是相同的.
5.Many people are opposed to the sale of arms on principle.
许多人根据自己的是非观反对出售武器.
6.She leads her life according to Christian principles.
她以基督教教义作为生活的准则.
7.The principal and the vice-principal of the college both attended the meeting.
学院的正副院长均出席了会议.
8.My principal concern is my family's welfare.
我至为关心的是我一家的幸福.
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