difficult and miserable conditions
惨境
to make an arduous journey
跋山涉水
difficult to size up
不可捉摸
an arduous trip over land and water
跋山涉水
difficult to get at the truth
百口难辩
to make an extremely arduous journey
餐风饮露
long-term and arduous task
长期而艰巨的任务
Long and arduous journey
长途跋涉
difficult group
(分类学)"困难"群
Difficult even to move one step
寸步难行
a glorious but arduous task
光荣而艰巨的任务
difficult to cultivate plants
东扶西倒
magnificent and arduous historic mission
宏伟而艰巨的历史性任务
extremely arduous condition
极端状态