390.improve in (=get better)有改进,好些
391.improvement in表示原物有改进,好转
392.include…in把…列在…里面
393.inclusive of把…包括在内
394.independent of独立的,不受约束的
395.indicative of表明,说明
396.be indifferent to (=not interested in)对…漠不关心,冷淡,不在乎
397.(be) inferior to (=less good in quality or value)比…差; superior to比…好
398.inform sb. of sth.通知,告诉
399.be innocent of无罪的,无辜的
400.insist on (=order sth. to happen)坚持要
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) 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
426.(not) in the least一点(也不),丝毫(也不)
427.at one's 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
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)