Lub Zog Thauj Khoom Taw qhia
Kev thauj khoom yog hais txog lub zog thiab qhov tam sim no dhau los ntawm xaim, kab hluav taws xob, thiab khoom siv hluav taws xob (hloov hluav taws xob, cov txuas hluav taws xob, thiab lwm yam). Qhov kev thauj khoom no tsis yog ib qho muaj nuj nqi tas li tab sis tus nqi hloov pauv uas hloov nrog lub sijhawm. Vim tias cov khoom siv hluav taws xob tsis khiav tib lub sijhawm, txawm tias lawv tau khiav tib lub sijhawm, lawv txhua tus tuaj yeem tsis ncav cov peev txheej rated.