模态（Mode）
一种振动振幅分布形态，通常以与谐振器波节相关的某些主导特征来表征。例如，轴向谐振在端面或螺柱表面上没有波节。简单的模态包括轴向、径向和弯曲模态。
每个谐振器都可能具有许多种模态。在大型变幅杆和开槽变幅杆中，模态可能相当复杂。
Mode
An amplitude pattern of vibration that is generally characterized by certain predominate features related to the resonator's nodes. For example, the axial resonance has no nodes on the face or stud surface. Simple modes include axial, radial, and flexural.
Every resonator can have many possible modes. In large horns and slotted horns, the modes can be quite complex.