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
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