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The structure "或⋯⋯ ，或⋯⋯" is used in Chinese to present alternatives or possibilities, similar to "either... or..." in English. It allows the speaker to indicate that there are multiple options or scenarios that could apply.
In the example "他把信藏在某个秘密的地方了，或一块石头下面，或一棵树后面," it translates to "He hid the letter in a secret place, either under a stone or behind a tree." Here, the speaker suggests two possible locations where the letter might be hidden.
Another example is "阿姨每次来我家都带着一群朋友，或二三人，或三四人，大家说说笑笑," which means "Every time my aunt comes to my house, she brings a group of friends, either two or three people, or three or four people, chatting and laughing." This illustrates that the number of friends can vary within the specified ranges.
Overall, "或⋯⋯ ，或⋯⋯" is a useful grammatical structure for expressing uncertainty or variability in options, making it an important aspect of conversational and written Chinese.