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开后门 under-the-counter deals; offer advantages to one's friends or relatives by underhand means

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开门红 to begin well,to make a good start

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开小灶 give special favor

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开夜车 burn the midnight oil; work over night

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侃价 bargain

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空头支票 accommodation note, lip service

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空中小姐 air hostess; air stewardess

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口头禅 pet phrase

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酷毙 extremely cool; the coolest

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宽带(ADSL技术即非对称数字用户环路技术) ADSL(Asymetric Digital Subscriber Line)