VOA慢速英语:Volunteer Programs Offer Seniors a Way to Spend Their Time Helping Others

例句：He studies under a tutor.
      他在导师的辅导下搞研究。

家庭教师, 私人教师

例句：His father employed a tutor for him.
      他父亲给他请了一位家庭教师。

vt. 当…的教师,教,指导,约束

例句：He tutored the children in mathematics.
      他指导孩子们学数学。

2.constantly adv.不断地;时常地

例句：constantly repeating the same mistakes
       不断地重复同样的错误

      A wrongdoer is constantly haunted by the fear of discovery.
      作恶者经常心中害怕被发觉。

3.yearly adj.每年的, 一年一度的

例句：The flower show is a yearly event in our town.
      我们镇上的花展一年举行一次。
 
      The earth makes a yearly revolution around the sun.
      地球每年绕太阳一周。

4.payback n.投资回收率

例句：expect a payback within six years.
      期望在六年内收回一切投入

5.enrollment n.登记;入会;入伍;登记人数

例句：The full fee is payable on enrollment.
       所有费用在注册时缴付。

6.vocational a. 职业的

例句：She was given some quick training at the vocational school.
      她在职业学校受过速成训练。