China chachikulu, United States ndi zinthu zapadziko lonse lapansi. Blocks yamakono yamakono imathandizira kugonjera dziko lojambula la wojambula. Njira zingapo zimapangitsa kuti ntchito yabwino kwambiri ya gypsum gypsum gypsum ilo imapereka zomatira zenizeni komanso zimapangitsa kuti utoto ukhale wonyezimira. Lolani kuti luso la ojambula likhale pamtundu wapamwamba kwambiri.