其次有关波前面的描述和三维坐标系之间的变换也是个难点。
Moreover, it is difficult to implement a description of the wave front and the transformation of three-dimensional system of coordinates.
在此基础上，对三种具体情况，详细论述了桡动脉脉搏波前面若干阶梯波形的变化规律及其所对应的生理学含义。
On this basis, the variant behavior and the physiology significance of a number of the formerest steps of the pulse wave in radial artery are described in detail.
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