1. The sniper peered through the sighthole of his rifle, searching for any movement in the distance.
狙击手透过枪上的视孔，搜索远处的任何动静。

2. The detective carefully examined the sighthole on the door, hoping to find any clue about the break-in.
侦探仔细检查了门上的瞄准孔，希望能找到任何有关入室盗窃的线索。