内波传播方向以西向为主。
即利用旋转四方柱子，改变波散射截面的大小，从而实现能带和波传播方向的调节。
In other words, the rotation of the square rods varies the area of the scattering sections, so that the band structures and the propagation directions of acoustic waves can be controlled.
这种排列是各向异性的，使波的传播沿一个方向比另一个方向要容易。
That alignment, known as anisotropy, makes it easier for waves to travel in one direction than the other.
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