吃透英语课本，提升在校竞争力
adj. 艰巨的；费力的
副词：arduously
...a long, hot and arduous trip.
…一段漫长、灼热、艰难的旅程。
Climbing the mountain was an arduous task.
攀登那座山是一项艰巨的任务。
make arduous efforts
v. 努力奋斗
adj.努力的；费力的；险峻的
hard
rapid
bold
struggling
