pron.

1. （反身代名詞）自己，自身
   One shouldn't overwork oneself.

   一個人不應該過分勞累。

2. 親自，本人
   To do something oneself is often easier than getting someone else to do it.

   自己去辦理一件事常常比請人去做來得容易。

pron.

1. [reflexive] used as the object of a verb or preposition when this is the same as the subject of the clause and the subject is ‘one’.
2. [emphatic] used to emphasize that one does something individually or unaided.
3. in one's normal and individual state of body or mind.