work in
1．bring or put in；insert；penetrate带进去；插进；引进
The author worked in a few lines about his own life．作者插进了几笔自己的经历。
When he wrote his essay， he worked in several quotations of Chairman Mao．他写文章时引用了几句毛主席的话。
He worked in the key and opened the room．他把钥匙插进去，打开了房门。
2．arrange a time for 为…安排出时间
The doctor might be able to work you in between his other appointments，if you will just wait a while．你如果愿意稍等片刻，医生或许能把你插在其他预约的病人中间给你看病。