two sisters,fair and bright.They alaways run,but never meet.What are they?

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two sisters,fair and bright.They alaways run,but never meet.What are they?
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two sisters,fair and bright.They alaways run,but never meet.What are they?
two sisters,fair and bright.They alaways run,but never meet.What are they?

two sisters,fair and bright.They alaways run,but never meet.What are they?
of course magnet. tell me another one

磁铁(magnet)