chum

US /tʃʌm/

UK /tʃʌm/

C1 高級
n. (c.)可數名詞密友 ; 室友 ; 結為密友
He's been my favorite chum since elementary.

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生理學速成班:先天免疫系統 (Immune System, part 1: Crash Course A&P #45)

09:13生理學速成班:先天免疫系統 (Immune System, part 1: Crash Course A&P #45)