natural fiequency的用法和樣例：
例句
- This paper presents a method used for calculating the natural frequency of gases subjected by small pressure pulsations in pipe systems.
本文介紹一種用以計算微壓擾動下管道中氣柱自振頻率的方法。 - In this paper,the natural frequencies and modes of box water body researched by using three-dimensional finite element method.
本文運用三維有限元方法離散水體，研究了箱形術體的自振頻率及動水壓力振型。
