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超神奇的“中式悠悠球”---空竹 Diabolo —The Amazing Chinese “Yo-Yo" 空竹,最早由民间游戏“陀螺”演变而来,若从曹植所作《空竹赋》算起,它的历史至少也有1700年了。空竹为何旋转不停,又为何转动时会发声呢? The Diabolo originated from the spinning top. If we trace its origins back to an article written by Cao Zhi, its history is at least 1700 years old. Why does the diabolo keep spinning, and why does it make a sound while spinning? 这是源于物理中的杠杆平衡和空气振动原理。 首先,一个旋转物体的旋转轴所指方向,在不受外力影响时是不会改变的,转得越快时稳定性越高,越不容易被外力扰动。其次,高速旋转中,空竹内腔中的空气柱会受到扰动,气柱在共鸣效应的作用下按一定频率振动发声。空竹的转速越高,空竹内腔内的气柱扰动便越强烈,频率就越高,响度也越大,声音变得更加尖锐和响亮。 空竹以人与空竹的互动韵律为语言,讲述着古人对力道、对运动的理解。 This is due to two physical principles: Firstly, when something spins, its axis doesn’t change direction unless an outside force acts on it. The faster it spins, the more stable it becomes. Secondly, as it spins quickly, the air inside it swirls around, and it creates a sound. The faster it spins, the louder it gets! As we spin the Diabolo, we see the ancient understanding of force and motion. #少儿英语 #英语 #了不起的中国智慧
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