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Patrol is an act of moving back, moving, viewing, and alerting in a specific area for the sake of safety and vigilance. The patrols in the dark are more difficult, mainly reflected in the limitations of lighting technolo……
The origins of diving can be traced back to more than 2,500 years, when a diver named Scyllis conducted a commercial dive. An ancient Greek historian named Herodotus recorded the 5th century BC, the Persian king Xerxes, ……
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