By the end of the day we were tired but happy.
一天結束時，我們很累，但很高興。
I always leave a clear desk at the end of the day.
每天工作結束時，我總是把桌上收拾干凈不放任何東西。
The new model will be in production by the end of the year.
新型號將于年底投產。
We had come to a dead end in our research.
我們的研究工作已陷入絕境。
I'm sure you'll get there in the end.
我相信你最終會成功的。