這與您說的有異曲同工之處，也是英語中的習語。
2)You can't sell the cow and drink the milk.
3)A man can't spin and weave at the same time.
此我幹翻譯的：
I would like eating fish，and I also would like eating bear’s－paw,But I can't eat both of them ,I will Discarde the fish andeat the bear’s－paw.