Lub tuam txhab khoom faib ua cov khoom siv rau cov cim, cov khoom lag luam ntawm tus kheej, cov khoom lag luam ntawm cov khoom siv dag zog, cov khoom lag luam tawm dag zog rau cov neeg siv khoom hauv tsev thiab txawv teb chaws nrog cov kev xav tau sib txawv. Cov khoom muag tsis tsuas yog npog lub lag luam hauv tsev, tab sis tseem muag lawv mus txawv teb chaws, tshaj tawm thoob 160 lub tebchaws thiab thaj chaw thoob ntiaj teb.
