basic frequency的用法和样例：
例句
- Much remains to be done, then, but we anticipate that the same results will be generated by the HHT method to improve the resolution of the time and frequency domains.
而本篇文章则是利用时频分析技术，以共振主频随时间之变化来探讨局部地区土层之场址效应，尤其是强震与弱震间土壤共振主频之差异。 - According to the oscillation theory of membrane, the inherence frequency and basic frequency of the flexible membrane are obtained.
根据薄膜振动理论得到了弹性膜片的固有频率和基频。
