流水线尽头，箱子在赶路

A high-speed automated packaging line seals cardboard boxes in a focused industrial scene, framed to a 3:2 ratio with the conveyor running left to right and filling the lower third. The sealing machine head, mounted center-left, anchors the frame as the primary subject, working over a steady stream of uniform brown boxes that occupy center and center-right and stretch toward the right edge. Three foreground boxes stay sharp and dominate the midplane, while a repeating procession recedes into the upper-right, building depth and rhythm. Harsh mechanical surfaces show brushed steel and painted panels, small oil streaks and rivet textures set against matte cardboard with folded seams. Cool rim-lighting from the upper-left pairs with a soft secondary fill from the right, carving crisp highlights on metal edges and gentle shadow gradients beneath the boxes. Motion-blur streaks trail the boxes' edges to emphasize speed, while the sealing head and nearest box hold sharp focus, producing shallow-to-moderate depth layering. The upper two-thirds recede into an out-of-focus factory interior, faint vertical support columns visible, leaving negative space in the upper-left for overlay copy while keeping the industrial context intact.