A few simple magnetic tubes and steel balls let the children highly concentrate. Usually I will give them the parts separately and ask them to build a ball. Then they'll start thinking.
简单的磁铁棒和铁球就足够让小朋友集中精神。通常我会将各部分分开交给他们，叫他们作出一个圆球。之后他们就会开始思考。如何从三角形变成圆形呢？
簡単なマグネットチューブとスチールボールだけでとりこになる子供たち。三角形から球を作るって、どうやる？
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