25.specialist：['speʃəlist] 专家[(+in)] 拆解： special（）+ist

将来完成时The specialist will have updated the database by the end of this week

26.source 根源;来源[(+of)] 相似source ( )

27.souvenir：['su:vəniə] 纪念品,纪念物

They are permitted to tell the sources of the souvenir

28.category：['kætigəri]种类;部属;类目

29.melon ：['melən] ,甜瓜

30.walnut ['wɔ:lnət] 胡桃;胡桃树

The melon and the walnut are not the same category

31.programmer ：['prəugræmə]电脑程序设计师

32.instructor：[in'strʌktə]教员;教练;指导者

33. participant：[pɑ:'tisipənt] 关系者;参与者

现在完成进行时The programmer as well as the instructor has been assisting the participants

34. official：[ə'fiʃəl] 官员,公务员

35.colleague同事,同僚,同行[C]

现在完成进行时The official has been getting along very well with his colleagues

36.exit：['eksit] 出口,通道;太平门

One exit from the theater has been disconnected

37.dilemma：[di'lemə] 困境,进退两难

38. settler：['setlə] 移居者;殖民者;开拓者

The settlers will have been in a dilemma if they continue like this

39.Procedure程序;手续;步骤[U][C]

The chairman was quite familiar with the procedure for a meeting.

40. organ

　　 He will donate his organ after his death

41.mist薄雾,霭[C][U]

42.phenomenon：[fi'nɔminən] 现象拆解：phe+no+men+on

43.dawn：[dɔ:n]黎明,拂晓[C][U]

将来完成时The phenomenon will have been hidden in the mist at dawn

44.outcome：['autkʌm] 结果;结局;后果拆解：out +come

45.exploration：[,eksplɔ:'reiʃən]勘查;探测;探索拆解：explore +ation

The navy was satisfied with the outcome of exploration

46.circuit：['sə:kit] 电路;回路一圈

It takes less than a year for Mars to make a circuit of the sun

47.microwave 记忆法：micro( )+wave ( )

48.microscope记忆法：micro( )+scope( )

49.telescope记忆法：tele( )+scope( )