在英语中，人们会用“It 's been a long day”来表达疲劳（fatigue）。

Meaning

native speaker 1:

It means that the speaker's day has felt long and usually hasn't been very good.

它的意思是说话人的一天感觉很长，而且通常不太愉快。

native speaker 2:

If someone's had a long day, it means they're very tired from something like work or school and want to finally rest.

意思是他们因为工作或上学等事情很累，想休息一下。

native speaker 3:

Their day was extremely busy,a spouse may respond with this when they return from work and were busy. insinuating that they are tired.

*spouse：n. 配偶

例句：

You know, I’d like to help but it’s been a long day and I just don’t think I have the time or energy to get involved.

你知道，我很想帮忙，但是今天太累了，我觉得我没有时间和精力来参与。

I’m sorry, but its been a long day and we’re about to close. Come back tomorrow on the morning and you’ll get better service when everyone is fresh.

很抱歉，今天实在是太累了，我们就要关门了。明天早上再来，当所有人都精神抖擞的时候，你会得到更好的服务。

Its been a long day. Why don’t we get back to this work tomorrow. We should go home, relax and get some sleep. We’ll work more effectively in the morning after some proper rest.

今天太累了。我们为什么不明天再继续这个工作呢?我们应该回家，放松一下，好好睡一觉。经过适当的休息，早上我们会工作得更有效率。

内容参考：
https://www.quora.com/What-does-the-phrase-its-been-a-long-day-mean
https://hinative.com/en-US/questions/2962900

出处：头条号 @猫眼儿Zz