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Cybersecurity concept with cloud shield icon, data symbols, and hologram elements over the Chinese flag background representing digital protection. 3D Rendering
Closeup of a swing bar door lock, also known as a door security guard or flip latch, for an extra layer of security.
Scharnebeck, Germany ; September 29, 2025: Ground level view of the massive concrete structure of the ship lift, highlighting civil engineering and industrial design.
love locks on the fence at N Seoul Tower, a famous romantic landmark in South Korea.
The entrance to the Esna Lock on the Nile River, showcasing the hydraulic engineering of the structure with its long dam and calm waters. This photo was taken from a cruise ship.

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