Convex semicircular arc me ntsis

Raws li ib qho ntawm cov ua ib nrab puag ncig cov tuam txhab thiab cov chaw muag khoom hauv Suav teb, peb sov siab txais tos koj rau kev lag luam high-al caug dua ntsis kev muag khoom ntawm peb lub hoobkas. Txhua cov khoom lag luam customized yog nrog cov khoom zoo thiab cov nqi sib tw.