英语短语16
71.at someone's disposal 任...处理72.at the cost of 以...为代价73.at the mercy of受…支配74.at the moment 此刻,目前75.at this rate 这样的话,照这样下去76.at times 有时,间或77.aware of意识到,知道78.back and forth 反复地,来回地79.back of在…后面;在…背后80.back up支持,援助;(资料)备份;倒退;裱
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