1、Upton Sinclair is famous for his work as a muckraker, exposing the unsanitary conditions in the meatpacking industry.
厄普顿·辛克莱尔因其揭露肉类加工业卫生条件的作品而声名远扬，成为了一名揭发社会不公的记者。

2、The muckrakers of the early 20th century played a crucial role in raising awareness about social and political issues.
20世纪初的揭发者在提高人们对社会和政治问题的认识方面发挥了重要作用。