Nrog rau txoj kev loj hlob ntawm kev lag luam high-tech, ntau yam thiab xav tau cov ntaub ntawv tshiab, tshwj xeeb tshaj yog cov khoom siv ua haujlwm tshiab, tau nce tas li, thiab hmoov metallurgy yog ib qho ntawm cov ntaub ntawv tshiab.Nws muaj cov txiaj ntsig zoo xws li kev txuag hluav taws xob zoo, txuag cov ntaub ntawv, ex ...
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