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Now, I try to brush up my vocabulary in Japanese.  
In dictionary, both 義務 and 本分 mean "duty". Is there any differences in usage?  
And can I use 本分 instead of 義務 in following sentence?

私の公の行為を当局者以外に説明する義務はないと思う.

with regards,
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2012-06-27T03:29:29.017
5971
2012-06-27T03:57:25.063
623
question
words nuances
What is the difference between 義務and 本分?
* 義務 is a general term meaning "obligation".

> 国民には納税の義務がある  
>  船長は自分より先に全ての客を避難させる義務がある

  * 本分 particularly means "duty", or "activity that someone is supposed to be spending most of their time on according to their title/occupation", and does not necessarily have the strong meaning of "obligation".

> 学生の本分は学ぶことである

Using 本分 in your example is completely wrong.
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2012-06-27T03:50:30.457
5972
2012-06-27T03:57:25.063
2012-06-27T03:57:25.063
5971
answer