blue-collar

The factory manager praised the blue-collars for their hard work.

用法提示：此处 blue-collars 是名词 blue-collar 的复数形式，指蓝领工人。

He worked as a blue-collar for twenty years before becoming a manager.

用法提示：此处 blue-collar 为单数名词，指一名蓝领工人。

The union represents all the blue-collars at the port.

用法提示：此处 blue-collars 为复数形式，表示多个蓝领工人。