A device that shows wind direction

• Often a rotating pointer mounted on a roof

用于显示风向的装置

• 常为安装在屋顶上的可转指针

A thin, flat surface that turns or directs a fluid

• Such as a turbine blade or windmill sail

用于旋转或引导流体的薄而平的表面

• 如涡轮叶片或风车叶片

The webbed part of a feather on either side of the shaft

• Formed by interlocking barbs

羽轴两侧扁平如网的羽片部分

• 由互相钩连的羽枝组成

A thin sighting plate on a sextant or compass

• Used to align with a target or bearing

六分仪或罗盘上的薄型瞄准片

• 用于对准目标或方位

A stabilizing fin attached to a bomb or missile

• Helps keep the projectile on course

安装在炸弹或导弹尾部的稳定尾翼

• 帮助使弹体保持航向