| 摘要 |
A simple toy whistle includes a mouthpiece and multiple resonant chambers. In order to permit single notes to be played by one resonant chamber, while preventing the other chambers from producing audible tones when the whistle is played, each such chamber is provided an additional opening. This opening is provided with an annular boss so that it can be sealed by the pad of the user's thumb or finger when the corresponding chamber is to resonate.
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