他的工作非常辛苦的英语怎么说

"His job is very hard" 可以用英文表示为 "His job is very demanding" 或 "His job is very arduous."
"Demanding" 是指要求很高，需要很多精力和时间。例如："Being a doctor is a demanding job, but it's also very rewarding."
"Arduous" 指工作困难重重，需要很大的努力。例如："Hiking to the top of the mountain was an arduous journey, but the view from the summit was worth it."
另外，还可以用 "His job is very laborious" 表示工作非常辛苦。 "Laborious" 指工作费力，需要很大的努力。例如："Digging a hole by hand is a laborious task."