every dog has his day什么意思啊？

如题，这是啥意思呢？

every dog has his day是什么意思啊 Everything flips around.Every dog has his day Every dog has his day!If not now, when?If not you,who? Take it easy,! You know what they say, every dog has his day and you will have yours! every dog has its day。如何翻译 Every man has his faults.是什么意思？ every child has his own dream Every Jim has his Jerry.Where's my Jerry? Tom was very poor,but now he is very rich.Every dog has its day.是什么意思 Jack and his dog