back and forth是什么意思

词组	back and forth
释义	●ˌback and ˈforth (also ˌbackwards and ˈforwards) in one direction and then in the opposite one, repeatedly 来回；反复◆The rope swung back and forth from the branch.绳子在树枝上来回摇晃。◆She travels backwards and forwards between the factory and head office.她在工厂和总部之间来回奔波。

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