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participate v.参加；参与＋ant(……的人/物)→participant n.参与者；参加者
assist→assistant 助手 apply→applicant 申请人
account→accountant 会计 serve→servant仆人
immigrate→immigrant 移民，侨民 pollute→pollutant污染物
Some people know what they want to do from a young age，but many others just have a few ideas bouncing around in their heads.有些人年轻时就清楚自己想做什么，但更多的人往往是只有一些想法在脑子里晃来晃去。
bounce v.(使)弹起；反射；试探地透露(主意)；蹦；颠动 n.弹跳；跳动；弹性；反弹力；活力；精力
bounce around蹦来蹦去；弹来弹去
bounce back恢复健康(或信心等)；重整旗鼓
bounce sb. into sth. 追逼(或催逼)别人做某事
bounce sth. off sb. 向某人透露某事
(5)He’s had a lot of problems，but he always seems to bounce back pretty quickly.
他遭遇过很多挫折，但他似乎总能很快地振作起来。
(6)The problem of traffic jam bounced the city administration into corresponding measures.
交通堵塞问题迫使城市管理部门作出相应的措施。
Help and advise people in serious debt帮助和提供建议给负债累累的人
One popular test asks the participants to grade their preferences for a variety of work tasks.一项流行的测试要求参与者对各种工作任务的偏好进行打分。
