我正忙着处理一些其他的事情呢.
focus on sth/doing sth就是集中注意力做某事的意思.
finish off sth的意思就是"完成,做最后加工"
to do the last part of something; to make something end by doing one last thing
I need about an hour to finish off this report.
我需要一小时左右结束这篇报告.
They finished off the show with one of their most famous songs.
他们用自己的一首最著名的歌曲作演出的压台戏.