It had been a long and tiring day
这是漫长而又累人的一天。
It is very tiring work.
这是很累人的.工作。
I found the job tiring at first but I soon got used to it.
起初我觉得这份工作很累人，但很快就习惯了。
It's normal to feel tired after such a long trip.
这样长途旅行之后感到疲劳是正常的。
I'm too tired even to think.
我累得连想也不愿意想。