“hat”除了有“帽子”的意思以外，还有职位；角色；身份的意思。“Wear many hats”的意思是：身兼数职；同时扮演多个角色。

【例句】
During this unique time, many people have to wear many hats to support their families.
在这个特殊时期，许多人不得不身兼数职，养家糊口。

He starts his business from scratch and has to wear many hats, from business development manager, product manager and contract negotiator.
他从零开始创业，不得不身兼数职，从业务开发经理，产品经理到合同谈判代表。