forth [fɔ:θ]

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adv.向前；向外，往外

(from a place ) out or away, or (from a point in time ) forward

The wind moved the trees gently back and forth. 风吹得树轻轻地来回摇晃。
He gave forth a series of works in rapid succession. 他很快连续发表了一系列的作品。