鱼与熊掌不可兼得
Traditional (Taiwan):
魚與熊掌不可兼得
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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
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you can't always get everything you want
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you can't have your cake and eat it
Character by character
Sources