最善良的动物就是你，袋鼠妈妈。即使你在很担心你的乔伊的情况下，还是对一只爱发牢骚的坏脾气老袋熊这么好。

The kindest animal is you, Mother Kangaroo. Even when you were worried about your Joey, you were still kind to a grumpy complaining old wombat.

youdao

有一阵子人们在暗地里发牢骚，表达对政府应对通货膨胀政策的不满。

For some time there have been murmurings of discontent over this administration's policy on inflation.

《柯林斯英汉双解大词典》

他对他的饮食大发牢骚。

He squawked about his food.

youdao

Now men will go content with what we spoiled, Or, discontent, boil bloody, and be spilled.

现在人们也许会对我们的破坏得意洋洋或者大发牢骚，也许还会会血液沸腾，飞溅。

耶鲁公开课 - 现代诗歌课程节选