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