Zhège xiàngmù tā shì fùzérén, shěwǒqíshuí de qìshì hěn míngxiǎn.
He's the project lead, and his 'I'm the only one for this' attitude is obvious.
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From 《孟子·公孙丑下》: 如欲平治天下,当今之世,舍我其谁也? - 'if we wish to bring order to the world, in this age, who but me?' Mencius's bold self-assertion became the template for the idiom.
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Conveys strong self-confidence - admirable bravado or arrogant grandstanding depending on context. Common with 气势, 精神, 的样子. Often rhetorical rather than literal: the speaker is claiming they're the right person for the job.