PREP. If someone on something is on a surface or object, the surface or object is immediately below them and is supporting their weight.
- on the carpet/floor/beach/table/grass
PREP. 在……时候；
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on someday
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The event will take place on Wednesday.
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Experimenting with Java and Electronics on the Raspberry Pi. 在某系统平台上。
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We are very happy to have you on the team.