You use ourselves to refer to yourself and one or more other people as a group.
We sat around the fire to keep ourselves warm.
我们围坐在火边取暖。
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.
We all know that when we exert ourselves our heart rate increases.
我们都知道太卖力了会导致心跳加速。
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.
Others are feeling just the way we ourselves would feel in the same situation.
在相同的情况下,别人的感受和我们自己的是一样的。
If you say something such as 'We did it ourselves', you are indicating that the people you are referring to did it, rather than anyone else.
We villagers built that ourselves, we had no help from anyone.
那是我们村民自己修建的,没有依靠任何人的帮助。