For example when the fifth-grade science class gets to the leverage principle, the children do experiments with stones and broom handles. For mathematics in sixth grade, they use chess as a teaching device.
譬如五年級的自然課上到槓桿原理，孩子就拿石塊和掃把作實驗；六年級的數學課，則拿圍棋作教學道具。