Nws nyob txhua qhov chaw thiab tsis pom qhov twg: huab uas tuaj yeem muab cov ntaub ntawv nyob hauv vib nas this thoob ntiaj teb. Nrog nws, ntau ntawm nws cov duab no tau noj, cov nyiaj ntau dua ntawm cov ntaub ntawv kis tau nyob rau hauv txoj kev no. Dab tsi tsawg dua yog paub: Muaj ntau daim ntawv thov lossis apps siv huab. 15 feem pua ntawm txhua daim ntawv thov tshiab hnub no yog huab haiv neeg; Txoj kev sib koom no xav kom ntau dua ob zaug rau 32 feem pua hauv peb lub xyoos tom ntej no.