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
Definitions (粵典–words.hk)
語句
冇辦法同時得到或者達成兩樣好嘅嘢,只可以揀其中一樣 you must choose one or the other; you can't have your cake and eat it; literally: you can't have both the fish and the bear's paw at the same time
Definitions (Wiktionary)
proverb
One can't have one's cake and eat it, too.