mortar board
noun /ˈmɔːtə bɔːd/
  /ˈmɔːrtər bɔːrd/
 - a black hat with a stiff square top, worn by some university teachers and students at special ceremonies compare capTopics Clothes and Fashionc2, Educationc2
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| 单词 | mortar board | 
| 释义 | mortar boardnoun /ˈmɔːtə bɔːd/   /ˈmɔːrtər bɔːrd/  
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