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镜头1:计算14-9时,有位学生(生1)摆弄着自己的手指。我轻轻地对他说:“能不能不用掰手指的方法计算?”学生点点头,然而神情有些茫然。镜头2:在整理出十几减9
Lens 1: Calculation of 14-9, a student (students 1) play with their own fingers. I gently said to him: “Can you not calculate with a finger?” The students nodded, but looked a bit confused. Lens 2: finishing a dozen minus nine