The frequency may keep switch at the same condition, it is the best experiment using.
频率可以保持在相同的条件下切换，它是最佳的实验使用。
Is every bird flapping its wings at the exact same frequency?
每只鸟会以同样的频率扇动翅膀吗？
The digits on the radio's frequency dial stay the same at all times.
无线电”“年代频率刻度盘上的数字保持不变。
The digits on the radio's frequency dial stay the same at all times.
无线电”“年代频率刻度盘上的数字保持不变。
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