不及物动词
1. (长期坚定不移的)斗争，运动
A crusade is a long and determined attempt to achieve something for a cause that you feel strongly about.
2. 长期坚定不移地奋斗
If you crusade for a particular cause, you make a long and determined effort to achieve something for it.
3. (发生于11世纪至13世纪的)十字军东征
The Crusades were the wars that were fought by Christians in Palestine against the Muslims during the eleventh, twelfth, and thirteenth centuries.
1. a series of actions advancing a principle or tending toward a particular end
e.g. he supported populist campaigns
they worked in the cause of world peace
the team was ready for a drive toward the pennant
the movement to end slavery
contributed to the war effort