inside
[介词]
used to indicate that something or someone is located in, happening within, or moving into the inner part of something

里面, 内部
along
[介词]
used to indicate a position parallel to a certain feature or path

沿着, 沿
Ex: There are beautiful along the river .
around
[介词]
in every direction surrounding a person or object
Ex: We built a around the garden to keep the rabbits out .

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