1. Cov yam ntxwv ntawm cov iav ntim ntim Cov yam ntxwv tseem ceeb ntawm cov ntim ntim iav yog: tsis muaj tshuaj lom, tsis muaj ntxhiab, pob tshab, zoo nkauj, zoo barrier zog, thiab rov ua dua tshiab. Nws muaj qhov zoo ntawm kev ua haujlwm kub, siab ua haujlwm, thiab kev ua haujlwm tu. Nws tuaj yeem yog ster...
Nyeem ntxiv