adj.努力的; 艰巨的; 难克服的; 陡峭的

arduous艰苦的
词源略。词义受词根ard的影响。

arduous task → 艰巨任务；艰巨的任务；任务艰巨
Long and arduous journey → 万水千山；经历长远路途的跋山涉水
arduous difficult → 艰巨的；艰苦的
arduous a → 劳累的
arduous journey → 跋涉；艰苦的旅行
arduous s → 费劲的；艰巨的；努力的；辛苦费力的
arduous paths → 陡峭的道路
an arduous hill → 陡峭的山

1. an arduous journey across the Andes
[汉]翻越安第斯山脉的艰苦之行
——来自《权威词典》
2. Take your ease, for the journey ahead will be long and arduous.
[汉]好好休息一下, 前面的路程远而艰难呢.
——来自《简明英汉词典》
3. The refugees made an arduous journey through the mountains.
[汉]难民们艰难地越过高山.
——来自《简明英汉词典》
4. The task is arduous; besides , there's not much time.
[汉]任务 艰巨, 同时时间又很紧迫.
——来自《现代汉英综合大词典》
5. We must have patience in doing arduous work.
[汉]我们做艰苦的工作要有耐性.
——来自《现代汉英综合大词典》

【Adjective】

1. characterized by toilsome effort to the point of exhaustion; especially physical effort;
"worked their arduous way up the mining valley"
"a grueling campaign"
"hard labor"
"heavy work"
"heavy going"
"spent many laborious hours on the project"
"set a punishing pace"
2. taxing to the utmost; testing powers of endurance;
"his final, straining burst of speed"
"a strenuous task"
"your willingness after these six arduous days to remain here"- F.D.Roosevelt
3. difficult to accomplish; demanding considerable mental effort and skill;
"the arduous work of preparing a dictionary"