401. instead of (=in place of) 代替，而不是…
402. instruct…in (=teach) 教.指導.訓練某人…
403. insure…for 把…保險(多少錢);
ensure 使安全;
assure…(of) 使…確信,保證
404. insure…against 保險…以防
405. intend…for 打算把…給
406. (be) intent on 專心致志, 堅決
407. in the interests of 符合…的利益；
be interested in 對…感興趣
408. interfere in干涉,
interfere with打攪,干擾
409. at intervals 每隔一會兒, 每隔一段距離
410. intervene in 干預
411. invest in 投資
412. be involved in (=become connected or concerned) 卷入, 參加
413. by itself (=alone, without help)單獨地,靠自己
414. in itself 本身;
of itself 自發(fā),自然
415. be jealous of 妒忌
416. jump at (=to be eager to accept)搶著接受,
417. jump on (=scold, tell of) 叱責
418. junior to sb. 年紀較…輕, 職位較…低.
419. (be) keen on 喜愛, 渴望
420. keep a close watch on ( =keep a sharp lookout for) 密切注視
421. keep…to oneself(=keep secret)不告訴別人
422. to(the best of) one’s knowledge 據…所知
423. at large(=at liberty, free) 在逃, 逍遙法外
at large(=in general) 一般來說, 大體上 ；
at large(=at full length; with details)詳細地
424. lean against (背)靠著…
425. at least 至少; at most 至多
426. (not) in the least 一點(也不), 絲毫(也不)
427. at one’s leisure 在…有空的時候
428. lend itself/themselves to適合于(某用途)
429. at length (=after a long time, at last)終于；
at length (=in detail, thoroughly)詳細地
430. go to any length想一切辦法, 盡一切力量
431. be liable to (=be subject to)易于..的,應受(罰)
432. be liable for 對…應負責任的
433. lie in 在于
434. in life 一生中
435. for life 終身
436. in the light of (=considering; taking into account) 考慮到, 根據
437. throw light on ( = make clear, explain) 使…更為清楚, 提供線索, 闡明
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,很長時間(否定句.疑問句中)
441. before long (=soon)不久, 過了不久以后.
442. in the long run (=in the end)從長遠來說,最后;
in the short term (從短期來說)
443. (be) at a loss 不知所措
444．major in 主修某課程
