Hexagonal net qauv tuaj yeem siv rau kev txhawb nqa txoj kab nqes, khawb, pob zeb nto net mine kev txhawb nqa daim ntawv, cov kab nqes hav (xim ntsuab), railway txoj kev cais thaiv, nws tuaj yeem ua rau hauv lub tawb, cushion, siv rau cov dej ntws, dej nyab DAMS thiab seawall yaig. tiv thaiv thiab reservoir, dej kaw tawb.Dr...
Nyeem ntxiv