直到电压加上去以后，石英晶体才会以某一频率振荡。
The quartz crystal does not vibrate at certain frequency until the voltage is applied.
由于阀门使用的高频率，以及石英粉末的研磨特性，都要求耐磨性很高的阀门才经受得起。
The high cycle rate of the valves, and the abrasive nature of the quartz powder require an abrasion resistant valve that will last.
加工成型的石英晶体的频率可从几十千赫兹到数百兆赫兹。
Quartz crystals are manufactured for frequencies from a few tens of kilohertz to hundreds of megahertz.
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