"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"
"his final, straining burst of speed"
"a strenuous task"
"your willingness after these six arduous days to remain here"
"the arduous work of preparing a dictionary"
来自《权威词典》
来自《简明英汉词典》
来自《简明英汉词典》
来自《现代汉英综合大词典》
来自《现代汉英综合大词典》