a long and determined attempt to achieve something that you believe in strongly

They have long been involved in a crusade for racial equality. 他们长期以来一直致力于争取种族平等的运动。

a moral crusade against drugs 反毒品的正义运动

one of the religious wars (= crusades) fought by Christians, mostly against Muslims in Palestine, in the 11th, 12th, 13th, and 17th centuries

to make an effort to achieve something that you believe in strongly

She crusaded against sex and violence on television. 她致力于反对电视节目中的色情和暴力。