1. 使命;天职
    If you have a vocation, you have a strong feeling that you are especially suited to do a particular job or to fulfil a particular role in life, especially one which involves helping other people.

    e.g. It could well be that he has a real vocation...
           很可能他是找到了自己真正的使命。
    e.g. Diana was a young mission school teacher convinced of her vocation to provide support for her schoolgirl pupils.
           黛安娜是教会学校的一名年轻老师，她深信帮助学校的女学生是其天职。

2. （认为特别适合自己的）工作，职业
    If you refer to your job or profession as your vocation, you feel that you are particularly suited to it.

vocation

    e.g. Her vocation is her work as an actress...
           她的职业就是当演员。
    e.g. She has no vocation for teaching.
           她不是当老师的料。