unique and irreplaceable; one of a kind; admitting no second
这幅画作是大师的巅峰之作，在全球艺术品市场中更是不可无一，不可有二的珍宝
This painting is the master's magnum opus, and in the global art market, it is a truly unique and irreplaceable treasure.
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unique and irreplaceable; one of a kind; admitting no second