... 公开存量 opening inventory 望远镜视野opening of the telescope 控制棒孔道 opening， control-rod ...
2
?望远镜视场角
... 望远镜瞄准镜 telescope; telescopic sight; 望远镜视场角opening of the telescope; 望远镜调整圈 telescope collar; ...
双语例句
1
A usually adjustable opening in an optical instrument, such as a camera or a telescope, that limits the amount of light passing through a lens or onto a mirror.