芬兰工作室OOPEAA设计了这座湖边的观察亭，它是大型潜望镜的两倍，所以游客不必爬到山顶欣赏风景。
This lakeside observation pavilion by Finnish studio OOPEAA doubles as a giant periscope, so visitors don't have to climb to the top to enjoy the view.
当时天色昏暗，难以用潜望镜观察，而潜艇的听音设备也坏了。
The failing light was such that observation by periscope could not be relied on, and the Upholder's listening gear was out of order.
观看地仪器观察仪器，比如潜望镜、显微镜或者望远镜。
A viewing instrument such as a periscope, microscope, or telescope.
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