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(gè)反射面，以達到在一個(gè)較寬的頻帶內實(shí)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(shí)適當調整均布縱肋的數目可以改變平底圓柱殼輻射聲場(chǎng)的指向性。
