perpendicular hydromagnetic shock wave

例句：

1. 1. The building is perpendicular to the street.
   这座建筑与街道呈直角。
2. 2. The car was perpendicular to the road.
   汽车与道路成直角。
3. 3. The angle between the two linesis perpendicular.
   两条线之间的夹角是垂直的。