merry-go-round

mastery
UK /ˈmɛɹiɡə(ʊ)ˌɹaʊnd/ US /ˈmɛɹiɡoʊˌɹaʊnd/noun

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What does 'merry-go-round' refer to in this sentence?

The power station receives coal via a merry-go-round system of trains.