on
used to show that an object is physically in contact with or attached to a surface or object
在...上, 在
[介词]
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in, into, or at the space that is separating two things, places, or people
在...之间, 在...中间
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at or toward the back of something or someone, typically hidden by it or them
在...后面, 在后方
[介词]
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used when we want to talk about a person or thing for the first time or when other people may not know who or what they are
一个, 一
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