1、检查孔
... sight 视线，视距，瞄准器，瞄准 sighthole 检查孔，观察孔 sighting 瞄准，观察 ...
2、观察孔
... sight-seeingship游览船 sighthole观察孔 sightinganchor起锚检视长期锚泊中 ...
3、窥视孔
...窥视孔 diopter; eye hole; eyepiece; gloryhole; inspection hole; inspection window; loohole; peep eye; peep hole; peep sight; peepdoor; peephole; sight hole; sight port; sighthole; spyhole窥视口 view-port .