sight vane

• 透视孔,瞄准器,瞄准孔,觇板

sight vane的用法和样例：

例句

1. On unmarked field courses no part of the sight may be modified for the purpose of having means for range finding.
   在无标示距离的轮赛中，瞄准器的任何部分不可作为提供测量场地距离的用途。