Tāmen jiào tā Duōkè, yīnwèi tā shì duì lǐ de yīshēng.
They call him Doc because he is the team's doctor.
Tips
usage
多克 is a phonetic transliteration of the English nickname 「Doc」 (short for Doctor) or the name Dock/Doke. It appears in fiction, film dubbing, and as a character name.