| 释义 |
〔depression〕The angular distance below the horizontal plane through the point of observation.俯角：从观察点看，在水平平面下的角距离〔flat〕Having a horizontal surface without a slope, tilt, or curvature.水平的：具有无倾斜度、倾斜角或弯曲的水平平面的〔flatwise〕With the flat side down or in contact with a surface.平平地，扁平地：以扁平面向下或与另一平面接触 |