hole punch
noun [ C ] uk/ˈhəʊl ˌpʌntʃ/ us/ˈhoʊl ˌpʌntʃ/ (also hole puncher, uk/ˈhəʊlˌpʌn.tʃər/ us/ˈhoʊlˌpʌn.tʃɚ/)
打孔器
a device used for making holes in pieces of paper so that they can be fastened together
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