Cov ntaub ntawv sib xyaw, vim muaj kev ua tau zoo thiab kev siv ntau yam, tau dhau los ua ib feem tseem ceeb ntawm kev lag luam niaj hnub no. Cov ntaub ntawv sib xyaw yog siv dav hauv ntau yam kev lag luam, xws li aviation, kev tsim kho, tsheb, thiab lwm yam. Txawm li cas los xij, nws feem ntau yooj yim kom tau raws li qee qhov teeb meem thaum txiav. Teeb meem...
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