1.be in the middle of sth忙着做某事
I'm in the middle of completing my thesis我正忙着完成我的论文。
2.be in the dark不知道；蒙在鼓里
He's in the dark of his promotion.他还不知道自己晋升了
keep sb in the dark不让某人知道
His mother keeps him in the dark abut his grandmother's disease.她的母亲不让他知道祖母的病情。
3.辨析：
colleague同事（范围适中）
coworker(一起工作的)同事（范围小）
from work同事（范围最大）
He is a friend from work.他是我的一个同事朋友
4.rule out the possibility of sth排除……；不考虑
I rule out the possibiity of being a teacher as my career development.在职业发展上，我不考虑当老师。
5.call off the meeting取消会议
6.the bargain shoppers购物血拼的人
We can't win over these bargain shoppers.我们干不过那些购物血拼的人的。
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