例如:
洗澡 (xi3 zao3 -> xi2 zao3)
老鼠 (lao3 shu3 -> lao2 shu3)
老师 (lao3 shi3 -> lao2 shi3)
老虎 (lao3 hu3 -> lao2 hu3)
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Experiment #7 - Forces (Frictional Force)
Experiment #6 - Forces (Frictional Force)