These small tracks have a tiny point at the end of each toe.
这些小脚印的脚趾末有一个细小的点。
The second toe of your front foot should point ninety degrees to the side.
前腿的第二个脚趾应该转向九十度的方向。
Then, the positions of the incident wave, pile-toe reflection wave and flaw reflection wave can be determined by the position of singular point.
然后根据奇异点位置确定入射波、缺陷反射波、桩底反射波位置。
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