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
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compare capTopics Clothes and Fashionc2, Educationc2学位帽,方顶帽(大学师生在一些隆重场合戴的黑色帽)