polar pattern的用法和樣例：
例句
- Two reflecting surfaces on the reflector are designed to achieve an omnidirectional dispersion pattern over a wide range of frequency.
該反射器包含兩個反射面，以達到在一個較寬的頻帶內實現全指向性的目的。 - The directivity pattern of the sound field can be changed by adjusting the number of axial stiffeners when the axially driving force is exerted on one of the stiffeners.
當徑向激勵力作用在縱肋上時適當調整均布縱肋的數目可以改變平底圓柱殼輻射聲場的指向性。
