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Can I stop to take pictures in the tunnel in Jinan?

I can't.

Tunnel is an engineering building buried in the stratum, and it is a form of human using underground space. Tunnels can be divided into traffic tunnels, hydraulic tunnels, municipal tunnels, mine tunnels and military tunnels.

The tunnel conference held by the Organization for International Economic Cooperation and Development in 1970 integrated various factors, and defined a tunnel as an underground cavern with a cross-sectional area of more than 2 square meters built by any method for a certain purpose.