打击练习笼：网架、投球机与安全动线

Render a batting practice cage in a public sports park, treating the containment as the design problem. Show a long rectangular enclosure roughly 20 metres deep framed in galvanised steel tube, fully wrapped in fine black netting on the sides and overhead, with the net sagging slightly between supports so it reads as fabric rather than a solid wall. Detail the interior: a synthetic turf floor with a home plate mat, a pitching machine on a tripod at the far end behind its own protective screen, and a ball collection trough along one side. Show the entry as a baffled double-gate so a ball cannot escape when someone enters, with a warning sign and a helmet rack outside. Place two or three cages side by side, separated by internal netting. Keep the surroundings simple — a concrete apron, a bench, a bin. Show flat overcast daylight so the netting reads as a translucent grey volume against the park behind. Photorealistic, functional, black netting and galvanised steel, eye-level three-quarter view.