yú yǔ xióng zhǎng
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
鱼
yú
fish (CL:條|条[tiao2],尾[wei3])
与
yǔ
and
熊
xióng
bear
掌
zhǎng
palm of the hand