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401.instead of (in place of)代替，而不是
402.instruct...in (=teach)教，指导，训练某人
403.insure... for把保险(多少钱);ensure使安全;assure...(of)使确信，保证
404.insure...against保险以防
405.intend...for打算把给
406.(be) intent on专心致志，坚决
407.in the interests of符合的利益
be interested in对感兴趣
408.interfere in干涉，interfere with打搅，干扰
409.at intervals每隔一会儿，每隔一段距离
410.intervene in干预
411.invest in投资
412.be involved in (=become connected or concerned)卷入，参加
413.by itself (=alone, without help)单独地，靠自己
414.in itself本身;of itself自发，自然
415.be jealous of妒忌
416.jump at (=to be eager to accept)抢着接受，
417.jump on (=scold, tell of)叱责
418.junior to sb.年纪较轻，职位较低
419.(be) keen on喜爱，渴望
420.keep a close watch on (=keep a sharp lookout for)密切注视
421.keep...to oneself (=keep secret)不告诉别人
422.to (the best of) ones 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
426.(not) in the least 一点(也不)，丝毫(也不)
427.at ones leisure 在有空的时候
428.lend itself/themselves to 适合于(某用途)
429.at length (=after a long time，at last) 终于
at length (=in detail，thoroughly) 详细地
430.go to any length 想一切办法，尽一切力量
431.be liable to (=be subject to) 易于的，应受(罚)
432.be liable for 对应负责任的
433.lie in 在于
434.in life 一生中
435.for life 终身
436.in the light of (=considering;taking into account) 考虑到，根据
437.throw light on (=make clear，explain) 使更为清楚，提供线索，阐明
438.in line with (=in agreement with) 符合，一致 389.improve sth. (make sth. better)把原物改进
improve on (=produce or be sth. better than...)另做一物比原物更好
439.long for (=want very much) 渴望，希望得到
440.for long 很久，很长时间(否定句，疑问句中)
441.before long (=soon) 不久，过了不久以后
442.in the long run (=in the end ) 从长远来说，最后;in the short term (从短期来说)
443.(be) at a loss 不知所措
444.major in 主修(某课程)
445.as a matter of fact 实际上，事实是
446.by all means (=at all costs) 不惜一切
(=certainly) 当然行;by means of 用by no means 完全不，决不
447.on memory of 为纪念
448.on the mend (=in the process of recovering) 好转，在康复中
449.mention sth. sb. 向某人提起某事
450.at the mercy of (=in the power of ) 任摆布，在支配下