401.intend……for打算把……给

402.(be) intent on专心致志，坚决

403.instead of (in place of)代替，而不是……

404.in the interests of符合……的利益

405.instruct……in (=teach)教，指导，训练某人……

406.insure…… for把……保险(多少钱);ensure使安全;assure……(of)使……确信，保证

407.insure……against保险……以防

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)

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

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