1） or意思为否则.例如：
I must work hard， or Ill fail in the exam. 我要努力学习，否则考试要不及格了。
2） eitheror 意思为或者或者.注意谓语动词的主谓一致采用就近原则。例如：
Either you or I am right. 不是你对，就是我对。
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