13、 around the clock 24小时不停

　　Martha studied around the clock for management exam.

　　14、 as far as I know 就我所知

　　15、at home with 对..很熟悉

　　She is at home with problems like this.

　　16、 back out

　　1) 退出

　　A: Wasnt Bert supposed to sing tonight?

　　B: Yes、 but he backed out at last minute

　　2）不履行

　　She finally backed out of her promise.

　　17、 be cut out for 天生适合

　　Im not cut out to be a hero.

　　18、 be absorbed in

　　She has been absorbed in a horrorfiction. I cant tear her away.

　　19、 be addicted to 对上瘾

　　She has been addicted to drugs for years.

　　20、be attached to 对有感情

　　A: Im amazed that you are still driving that old car of yours. I thought you would have gotten rid of it years ago.

　　B: It runs well and Ive actually been quite attached to it.

　　21、 back up

　　1) 累积

　　The subwayis running behind schedule、 and traffic is backed up for blocks.

　　I dont know if well make the 6:30 show.

　　2) 支持

　　Ill back it up.

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