It turns out that the custom of sweeping tombs came from like this! 
It turns out that the custom of sweeping tombs came from like this! It turns out that the custom of sweeping tombs came from like this! It turns out that the custom of sweeping tombs came from like this! It turns out that the custom of sweeping tombs came from like this! It turns out that the custom of sweeping tombs came from like this! It turns out that the custom of sweeping tombs came from like this! It turns out that the custom of sweeping tombs came from like this! It turns out that the custom of sweeping tombs came from like this! It turns out that the custom of sweeping tombs came from like this! Article source: Popular Science China
