今天讲的是复合词， 今天音频里有很多词

sandcastle /ˈsændkɑːsl/  

mate

classmate | roommate | teammate  。

man and woman

policeman postman  firemanchairman，

policewoman, postwoman,firewoman, chairwoman

chairperson 

side

seaside | riverside 

board  

blackboard | noticeboard  

ball

basketball | football | baseball | meatball | fireball | eyeball 

body 

everybody | anybody | nobody

make up  phrasal verb 打扮  -> makeup noun 化妆品

pass by phrasal verb -> passer-by noun 过路人  复数 passers-by