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421.keep…to oneself(=keep secret)不告诉别人
422.to(the best of)one's knowledge 据…所知
423.at large(=at liberty，free)在逃，逍遥法外;at large(=in general)一般来说，大体上;at large(=at full length; with details)详细地
424.lean against( 背 ) 靠 着 …
425.at least 至少;at most 至多
