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| + | ====== 13. The singing ruler ====== | ||
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| + | When a ruler is clamped at one end and struck, it oscillates and emits a characteristic sound. Investigate how the sound depends on relevant parameters. | ||
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| + | ====== 13. 歌唱的尺子 ====== | ||
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| + | 当一把尺子一端被夹住并敲击时，它会振荡并发出特有的声音。请探究该声音如何随相关参数变化。 | ||