polar pattern的用法和样例：
例句
- Two reflecting surfaces on the reflector are designed to achieve an omnidirectional dispersion pattern over a wide range of frequency.
该反射器包含两个反射面，以达到在一个较宽的频带内实现全指向性的目的。 - 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.
当径向激励力作用在纵肋上时适当调整均布纵肋的数目可以改变平底圆柱壳辐射声场的指向性。
