chalk talk
柯林斯詞典
1. N an informal lecture with pertinent points, explanatory diagrams, etc, shown on a blackboard 粉筆教學(xué); 在黑板上畫(huà)圖說(shuō)明的非正式的講縯[美國(guó)英語(yǔ)]
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1. N an informal lecture with pertinent points, explanatory diagrams, etc, shown on a blackboard 粉筆教學(xué); 在黑板上畫(huà)圖說(shuō)明的非正式的講縯[美國(guó)英語(yǔ)]