Peb tuaj yeem nrhiav tau cov ntaub uas tsis nyob hauv peb pawg uas tau pom zoo ua ntej tab sis lawv muaj qee qhov kev txwv. Piv txwv li, koj yuav tsum muaj cov khoom txaus los siv ib yob ntaub tag nrho, qhov no feem ntau yog 100m.

Yog tias koj npaj yuav siv ib daim ntaub tshwj xeeb uas tsis tau pom hauv peb lub vev xaib, tej zaum peb twb muaj ib daim ntaub zoo sib xws uas peb tau nrhiav lawm. Yog tias peb tsis tau nrhiav daim ntaub uas koj tab tom nrhiav ua ntej, thov nco ntsoov tias nws yuav siv sijhawm los nrhiav cov ntaub zoo.