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

　　I’ll back it up.

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　　22、 be bound for 到……地方

　　The bus is bound for New England.

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　　23、 be (feel) myself 找到自我

　　I’m feeling myself again.

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　　24、 be burned up 生气

　　She was really burned up at the news.

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　　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.

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　　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.

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　　28、be stuck 卡住了

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

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　　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.

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　　30、 break new ground 有了新的突破

　　His architecturaldesign broke new ground in the field.

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