411. invest in 投資
412. be involved in (=become connected or concerned) 捲入, 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)搶着接受,
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