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,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 itselfthemselves 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)

　　445. as a matter of fact 實際上, 事實是

　　446. by all means (=at all costs)不惜一切. (=certainly) 當然行;by means of用…; by no means 完全不, 決不

　　447. on memory of 為紀念…

　　448. on the mend (=in the process of recovering) 好轉, 在康復中

　　449. mention sth. to sb. 向某人提起某事

　　450. at the mercy of (=in the power of) 任…擺布, 在…支配下

　　451. be in a mess 亂七八糟, 處境困難 make a mess of 弄亂, 打亂

　　452. bear(or keep)…in mind(=remember)牢記

　　453. bring(or call)to mind(=remember)使回想起

　　454. by mistake(由于粗心,健忘原因而)錯誤地

　　455. at the moment (=now) 此刻,現在 for the moment (=for the time being)暫時 just a moment 稍等片刻 at the last moment 在最后一刻

　　456. in the mood for 有情緒去做..,有心境做.

　　457. no more…than 和…一樣都不…

　　458. for the most part 多半,大多數,一般來說

　　459. at (the) most 最多, 至多

　　460. make the most of 充分利用