in closing 最后【人教版高中英语必修三 unit 4 （单词与全书例句）】

 in closing   
最后

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1. In closing, exploring space provides the world with many different benefits. 

2. In closing, I would like to thank you for all the happy times you shared with me, and all the great memories you gave to me.

1. 最后，探索太空为世界带来了许多好处。

2. 最后，我想感谢你与我分享的所有快乐时光，以及你给我的所有美好回忆。