但厚度增加到一定值时，磨损速率不变。
When thickness increases above a certain value, wear rate becomes unchanged.
因此即使速率不变，也就是说速度矢量的的大小不变，但它的方向可以做旋转。
So, even if the speed is constant, that means, even if a length of the velocity vector stays the same, the velocity vector can still rotate.
提出了一种能够抑制多径干扰的基带波形设计方法，该方法是通过保持传输信息速率不变，在成形滤波器第二个零点叠加信号来实现的。
A waveform design method that can restrain the multipath effect was proposed. It was achieved by placing signal on the second zero point of waveform filter and keeping the information rate.
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