Joke Collection Website - Mood Talk - Talk about how soldiers look at the water with periscope under water.
Talk about how soldiers look at the water with periscope under water.
Put the periscope on the water to observe.
Because the pipeline of the diving mirror is very long, the diving mirror can be extended to the surface for observation without exposing the submarine.
Periscope is a kind of equipment on submarine and a tool to observe the external environment.
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