underwing

1. It is often necessary to determine the satisfactory release characteristics of tip tanks, underwing stores, bombs, or other devices.
   经常有必要测定翼尖油箱，翼下外挂物，炸弹或其它装置的投放特性。
2. An orange and black North American butterfly ( Limenitis archippus), resembling but somewhat smaller than the monarch. similar to the banded purple but with red spots on underwing surfaces.
   副王峡蝶一种桔色和黑色相间的北美蝴蝶（北美副王蛱蝶杨蛱蝶属）象但略小于大蝴蝶象白蛱蝶但后翅表面有红色的斑点。
3. The bird is in moult, and it may be the case that a lot of feathers have been lost from the underwing in one go, producing this white patch.
   这只鸟羽毛磨损，而且翼下的羽毛掉了很多，造成白色的区块。
4. Similar to the banded purple but with red spots on underwing surfaces.
   象白蛱蝶但后翅表面有红色的斑点。
5. High speed Photogrammetry in application on motion analysis of releasing aircraft underwing mount
   高速摄影测量技术在飞机外挂物投放运动分析中的应用

noun

1. moth having dull forewings and brightly colored hind wings