Raws li tus naj npawb ntawm cov tsheb thauj khoom lag luam tseem nce ntxiv, qhov kev thov rau cov koob yees duab zoo hauv kev lag luam tsheb kuj tseem nce ntxiv. Daim ntawv tshaj tawm tshiab qhia tau hais tias kev lag luam tsheb tso saib lub koob yees duab kev lag luam tau dhau los ua qhov chaw loj hlob sai thiab xav tias yuav loj hlob ntxiv rau ob peb xyoos tom ntej no.