chalk talk
柯林斯词典
1. N an informal lecture with pertinent points, explanatory diagrams, etc, shown on a blackboard 粉筆教學; 在黑板上畫圖說明的非正式的講縯[美國英語]
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1. N an informal lecture with pertinent points, explanatory diagrams, etc, shown on a blackboard 粉筆教學; 在黑板上畫圖說明的非正式的講縯[美國英語]