volunteer [?v?l?n?t??(r)]

【词频】★★★★★

n.志愿者；志愿兵

v. 自愿做；义务做；无偿做；自告奋勇；主动要求；主动提供（信息）

【例】n.志愿者

（2010天津）Brain scans of volunteers performing multiple tasks together show that as they shift from task to task, this front part of the brain actually takes a moment of rest between tasks.

【译】对执行多项任务的志愿者们进行脑部扫描的结果表明，当他们在任务与任务之间切换时，位于大脑前部的区域实际上在任务切换期间休息了一会儿。

【派】voluntary [?v?l?ntri] adj.志愿的；自愿的；自发的；无偿的

expense [?k'spens]

【词频】★★★★★

n.损失；代价；消费；开支

【派】expensive [?k'spens?v] adj.昂贵的；花钱的

【例】adj.昂贵的

（2013江西）And you can see that fishing can be an expensive pastime.Fishing lovers believe that their hobby is worth it.Others say that fishing is spoiling the environment and that it is a cruel hobby.

【译】你会发现钓鱼是一个昂贵的消遣。钓鱼爱好者认为他们的爱好是值得的。但其他人说钓鱼破坏环境，是一个残忍的嗜好。

inexpensive [??n?k'spens?v] adj.便宜的

magazine [?m?g??zi?n]

【词频】★★★★★

n.杂志；胶卷盒

medical [?med?kl]

【词频】★★★★★

adj.医学的；医疗的

【派】medication [?med??ke??n] n.药物治疗；药物

medicine [?medsn] n.医学；药物