drop of frequency的用法和樣例：
例句
- The existence of components decreases the shielding effectiveness and resonant frequency.
元件的存在使得機箱的屏蔽效能降低，諧振頻率下降。 - A new method based on the frequency decrease rate for fast identification of site liquefaction from surface acceleration records was presented.
摘要提出了一個以頻率下降率為基本指標的依據強震記錄快速識別場地液化的新方法。
