新东方在线雅思频道为大家准备了10天突破100个雅思听力高分词系列，本文是100个夺取高分的听力词中第三天的内容，赶快背起来!　　21、 back up

　　1) 累积

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

　　I don’t know if we’ll make the 6:30 show.

　　2) 支持来源：考试大

　　I’ll back it up.

　　22、 be bound for 到……地方

　　The bus is bound for New England.

　　23、 be (feel) myself 找到自我

　　I’m feeling myself again.

　　24、 be burned up 生气

　　She was really burned up at the news.

　　25、 be hard up for

　　I’m hard up for clothes、 but I have a lot of books.

　　26、 be head and shoulders above 好许多

　　In calculus, Joe is head and shoulders above his classmates.

　　27、be in the dark 蒙在鼓里

　　A: Do you have any idea what his notice is about?

　　B: I’m as in the dark as you are.

　　28、be stuck 卡住了

　　I can’t get this window open. It’s stuck.

　　29、 bite off more than one can chew. 贪多嚼不烂

　　A: I hear you’re taking an advanced physics course this semester.

　　B: I think I’ve bitten off more than I can chew.

　　30、 break new ground 有了新的突破

　　His architecturaldesign broke new ground in the field.