Biékàn tā xiànzài zhǐshì ge xiǎo zhíyuán, què xiōnghuái hónghúzhīzhì.
He may be only a junior clerk now, but he harbours lofty ambitions.
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history
From the 史记: the young farmhand 陈胜, mocked for talking of greatness, sighed 燕雀安知鸿鹄之志, 'how could sparrows know a swan's ambition?' In 209 BC he led the first great rising against the Qin.