You can't have your cake and eat it.
如果你想要走路、想要保持健康，就别买车。鱼和熊掌不可兼得。
Don't buy a car if you want to walk and stay healthy. You can't eat your cake and have it too.
youdao
你既想有稳定的收入，又不想工作。别忘了，鱼和熊掌不可兼得呀！
You want a regular income but don't want to work. Don't forget: you can't have your cake and eat it!
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