National Defense kev lag luam

Titanium yog cov hlau uas yog lub teeb thiab tawv. Txij li thaum nws nrhiav pom, nws tau teeb tsa cov kev hloov pauv hloov pauv hauv kev tshawb fawb thiab thev naus laus zis. Tshwj xeeb tshaj yog n...