A speaker or writer sometimes uses ourselves to refer to people in general. Ourselves is used as the object of a verb or preposition when the subject refers to the same people.
（用于强调第一人称复数主语；在比较正式的英语中，有时代替 us 作动词或介词的宾语以示强调）我们自己，我们本人
You use ourselves to emphasize a first person plural subject. In more formal English, ourselves is sometimes used instead of 'us' as the object of a verb or preposition, for emphasis.
If you say something such as 'We did it ourselves', you are indicating that something was done by you and a particular group of other people, rather than anyone else.