Tā yòng mǎkèbǐ zài báibǎn shàng xiěxià jīntiān de zhǔtí.
He wrote today's topic on the whiteboard with a marker.
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马克 is the phonetic transliteration of English 'mark' (same as the name 'Mark'). 马克笔 = 'mark pen' = marker. A classic hybrid loan: foreign root + native classifier word.
