| 单词 | mortarboard | 
| 释义 | mortarboard Word forms: mortarboards countable noun  A mortarboard is a stiff, black cap which has a flat, square top with a bunch of threads attached to it. In the United States, mortarboards are worn by students at graduation ceremonies at high schools, colleges, and universities.    Image of mortarboard      © Africa Studio, Shutterstock   | 
	
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