Definition
An expression used to tell someone not to worry, often considered condescending or offensive as it suggests the person is not intelligent enough to understand a particular matter.
（带冒犯意味地告诉对方）不必担心
"Don't worry your pretty little head about the details of this report; I will take care of it."
「别为这份报告的细节烦恼了，我会处理的。」
"The complicated parts of this project? Don't worry your pretty little head about them, just leave them to me!"
「这个项目的复杂部分？别为它们烦恼了，交给我吧！」
"You just focus on your job and don't worry your pretty little head about anything else."
「你只要专注于你的工作，其他的事情就不用烦恼了。」