see one's role as... ; see it as one's task to do sth. ; made it one's mission to do sth.
她以帮助无家可归者为己任。
Her mission in life was to work with the homeless.
《牛津词典》
有些人想要震惊世人，另一些人想要吸引人们关注科学，或者想更好地奖励那些以科研为己任的人。
Some want to shock, others to draw people into science, or to better reward those who have made their careers in research.
youdao
以和平为己任的传统首领。
A traditional leader who must broker peace.
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