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。