0 at an angle of 90° to a horizontal line or surface -- 垂直的，成直角的
1 a perpendicular line -- 垂直線
The special property of a plane is that these perpendiculars are in the same direction at every point.
The cutting edge is simply a flat sharpened surface which is perpendicular to the line of the shaft.
In a second simple case the wavevector is perpendicular to the velocity of the observer's frame.
In this case, is the unbounded triangular prism perpendicular to the plane of the triangle.
In the furrow irrigation plots they were located at the same distances perpendicular to the planted row.
The actual length was calculated geometrically, taking into consideration that the frontal and lateral projections of the left ventriculogram are perpendicular.
Note that these lines lie perpendicular to the line formed by the critical segment and the critical value rays.
The polariser is measuring polarisation perpendicular to the optical axis.
