[Ipr, It] ~ (for/after sth) try very hard (to obtain or achieve sth) （为获得或实现某事物）努力, 奋斗: strive for success 力争获得 成功 * strive to improve one's performance 努力提高演技. 
[I, Ipr] ~ (against/with sb/sth) carry on aconflict; struggle 进行斗争; 争斗: strive against oppression,the enemy 反抗压迫﹑ 抗击敌人.