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(gè)以頻率下降率為基本指標的依據強震記錄快速識別場(chǎng)地液化的新方法。
