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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