iav hardened
Koj tuaj yeem pom txhua yam nthuav txog lub ntsiab lus ntawm tempered iav hauv cov npe hauv qab no. Cov kab lus no muaj feem xyuam rau lub ntsiab lus tempered iav uas koj tau tshawb nrhiav. Ntawm no koj yuav pom cov lus tseeb thiab nthuav tshaj plaws txog lub iav fortress.
