1、In the end the propagation rule of wave front set under linear substitution mapping is given.
最后揭示了線性變量替換映射下波鋒集的傳播規(guī)律。

2、Direction:the horizontal vector perpendicular to the wave front along which the crext travels.
方向（D）：運動方向，垂直于波陣面的水平方向；

3、At each interface the spreading wave front is made discontinuous.
在每一分界面上擴展的波前出現(xiàn)間斷。

4、Successive positions of the wave front are then given by the envelopes of the secondary waves.
因此波前的相繼位置即為次波的包絡(luò)面。

wave front翻譯