mustn't grumble idiom UK humorous
没有什么好抱怨的，日子过得还不错
something you say to mean that your life is not bad and that you should not complain about it
"How's it going then, Mike?" "Oh, not too bad. Mustn't grumble." “那么，一切还好吧，迈克？”“哦，挺好，没有什么好抱怨的。”