Taw qhia: Thaum nws los txog rau cov roj av hauv av, xaiv cov yeeb nkab zoo yog qhov tseem ceeb rau kev ua kom muaj kev nyab xeeb, ua haujlwm ntev thiab ua haujlwm zoo.Ib qho kev xaiv zoo tshaj plaws uas tau ua nrov nyob rau hauv xyoo tas los no yog kauv seam yeeb nkab.Nrog nws cov welded yeeb nkab siv thiab ntau qhov zoo, kauv seam yeeb nkab yog bec ...
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