1. the ratio of the weight of an airplane to its wing area. 
   机翼同飞机重量的比率。
2. The luminous flux per unit area at any point on a surface exposed to incident light. 
   照度受光照射的表面上任一点单位面积上的通光量
3. The torrential rainfall yesterday caused floods and landslides which once again exposed the area in which urgent attention is needed here in Hong Kong. 
   昨天暴雨连场，导致不少地区受水淹浸和山泥倾泻，一再显示出我们急需关注的地方。
4. A hanging at each side of a stage directly behind the proscenium that serves to block the wing area and sidelights from the audience. 
   侧幕舞台前景后面两侧垂下的幕，用来挡住舞台两翼，使观众看不到旁过的光线
5. In film emulsion, an area exposed in some way other than directly through the lens, such as internal reflections between the various surfaces of the lens component. 
   在胶片感光乳剂中，不是直接经过透镜的某种方法曝光的区域，例如透镜组成部分各表面间的内部反射。

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