Fin whale has become a periscope?

鲸鱼鳍成了潜望镜？

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A viewing instrument such as a periscope, microscope, or telescope.

观看地仪器观察仪器，比如潜望镜、显微镜或者望远镜。

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They commonly had a periscope rangefinder attachment on the right side of their helmets, similar to Mandalorian helmets.

他们通常在头盔右边有一个潜望镜测距器附件，与曼达洛头盔类似。

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In the game Steel Diver the 3DS functions as a submarine periscope, with the screen displaying a view of enemy ships on the surface.

FORBES: Technology