商代搬运脚步声

6 seconds ancient Shang dynasty loading scene foley, multiple workers walking slowly with heavy cargo in arms, thick heavy layered footsteps on dry loess ground, dull dusty thuds, slow trudging pace, 3-4 people overlapping steps, no cart creaks, no horse noises, no wooden box impact sounds, dry earth footfall, natural open field reverb, clean noise-free