precast - (especially of concrete) formed into a particular shape and allowed to become solid before being used, flyover - a bridge that carries a road or railway over another road, reinforced - steel made stronger, span - the area of a bridge, etc. between two supports, tug - a boat with a powerful engine that can change direction easily and is used to pull large ships into and out of port, tile - a thin, usually square or rectangular piece of baked clay, plastic, etc. used for covering roofs, floors, walls, etc., bedrock - the hard area of rock in the ground that holds up the loose soil above, impenetrable - impossible to see through or go through, out of your depth - not having the knowledge, experience, or skills to deal with a particular subject or situation, resilient - able to return quickly to a previous good condition after problems, scaffolding - a structure of metal poles and wooden boards put against a building for workers to stand on, primer - a type of paint that you put on a surface before the main paint is put on, wearing course - the surface layer of a pavement that takes the wear of traffic,

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