3.   f iance  n.未婚夫

联想记忆   fiancée n.未婚妻新概念3课文

4. microwave  n. 微波，微波炉

构词 前缀micro-：tiny, very very small

  Eg:microswitch, microfilm, microscope,

        microsecond, microphone, microbiology

 反义前缀：macro- = great，large

  Eg:macroeconomic(s) 宏观经济学

 近义前缀：mini-小的，短的，小型的

  Eg:  minibus  miniskirt

5. safekeeping  n. 妥善保管

联想记忆 

keep sth. safe=>safekeeping

         Eg: Please keep your ID card safe

do evil:干坏事 =>evildoing

make trouble => troublemaking

6. identify  v. 鉴别，识别

例句

      He can't identify the person.

联想记忆

identity: n.同一性, 身份, 一致, 特性, 恒等式
      Eg:So far thearcheologists have been unable to discover her identity.

identification n.命名，确认