Lub Tshuab Nqa Iav Nqus Tsev
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Lub Tshuab Nqa Iav Nqus Tsev
Peb lub tshuab nqus tsev iav feem ntau yog siv rau kev teeb tsa thiab kev tuav iav, tab sis tsis zoo li lwm cov chaw tsim khoom, peb tuaj yeem nqus cov khoom sib txawv los ntawm kev hloov cov khob nqus. Yog tias cov khob nqus dej raug hloov, lawv tuaj yeem nqus ntoo, cement thiab hlau phaj.