Like a bird among the trees, it flies until weary and only then knows to return.
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Not used alone in modern Chinese. It survives in literary words like 羽翮 (feathers and quills, hence wings) and the phrase 振翮 (to spread the wings and soar), built on the feather radical 羽.
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Literary only — found in classical poetry and set phrases about flight, not in everyday speech.
