Meaning of 鱼与熊掌不可兼得

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xióng zhǎng jiān (Trad.: 魚與熊掌不可兼得)
lit. the fish and the bear's paw, you can't have both at the same time (idiom, from Mencius); fig. you must choose one or the other; you can't always get everything you want; you can't have your cake and eat it