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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 | 
