1. invest in投资

2. be involved in (=become connected or concerned)卷入，参加

3. by itself (=alone， without help)单独地，靠自己

4. in itself本身; of itself自发，自然

5. be jealous of妒忌外语学习网

6. jump at (=to be eager to accept)抢着接受，

7. jump on (=scold， tell of)叱责

8. junior to sb.年纪较…轻，职位较…低。

9. (be) keen on喜爱，渴望

10. keep a close watch on ( =keep a sharp lookout for)密切注视