500m hlau pom rau nruab nrab nyuaj granite chaw txua txiag zeb xa. Thawj qhov kev sim yog 50m, qhov thib ob kuaj yog 150m, tam sim no qhov kev txiav txim thib peb yog 500m.Lawv muaj ntau tus neeg xa khoom, thiab sib piv nrog cov tuam txhab loj, kev tawm tswv yim yog qhov zoo thiab zoo yog ruaj khov. Vam tias kev txiav txim tom ntej yuav yog 1000m.
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