A2 used when the subject of the verb is "they" or a group of people, and the object is the same group of people(they 的反身形式)他们自己,她们自己,它们自己
used for emphasis when the subject is "they"(用来强调主语they)
alone or without help from anyone else(完全)靠他们自己
for their use only(完全)给他们自己(使用)
More examples
The troops had camouflaged themselves so effectively that the enemy didn't notice them approaching.
When babies first learn to stand, they hold on to something to support themselves .
Did the children behave themselves?
The children have to learn to tidy up after themselves .
Many borrowers now find themselves caught in a precarious financial position.
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