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随便看	learn sth to your cost learnt learnt learn taught at your mother's knee learn taught something at your mother's knee learn taught sth at your mother's knee learn the hard way learn to your cost Leary, Timothy leary,timothy leary,-timothy lease leaseback leased leasehold leaseholder leaseholders leaseholds leases leash leashes leasing least least of all leastways 历史典故历史典故历史典故历史典故历史典故历史剧历史发展历史唯物主义历史大棋局：古代雄主用人评略历史大潮话陈云残留残留けん縮率残留すきま残留ひずみ残留オーステナイト残留偏差残留側波帯残留収縮率残留圧力残留塩素