aspect ratio
noun
1- the ratio of two dimensions of something as considered from a particular direction, in particular两个尺寸之比, 尤指：
1.1
- the ratio of the width to the height of the image on a television screen电视图像的宽高之比。
1.2
- Aeronautics the ratio of the span to the mean chord of an aerofoil【航空】（机翼的）展弦比。