| 摘要 |
A sounding toy with a rigid body of tapered cross section in both width and thickness produces a roaring sound when swung overhead at the end of a flexible cord. The roaring sound is enhanced by the reduction in thickness toward the outer end while the thicker base provides additional mass required for whirling. An aperture-type whistle communicating between the faces of the sounding toy imparts interesting variety to the sound.
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