planetary wave的用法和樣例：
例句
- Short wave lengths correspond with high frequencies,and long wave lengths to low frequencies.
短波波長和高頻相對應，長波波長與低頻相對應。 - As a qualitative analysis,finite element method gets a more satisfactory result in describing the propagation of the long wave of open channel unconstant flow.
作為一種定性分析，有限單元法對描述明渠非恆定流長波的傳播給出了滿意的結果。
