调谐音或波形能发生谐波共振的时候这些才会出现。
The nature of the wave motion in sound can be made clear by considering the tuning fork.
表皮细胞和保卫细胞的长轴方向与叶脉走向一致，垂周壁平直或波形；
Epidermis cells and long axis of guard cells tend towards the same direction of venation.
当第二个音叉被调谐到与第一个音叉调谐音或波形能发生谐波共振的时候这些才会出现。
This occurs only when the second fork is tuned to a resonant harmonic of the first tuning fork's note or waveform.
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