Luj tshib
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Cam khwb cia hlau luj tshib welded luj tshib seamless vuam
Lub luj tshib yog ib qho kev sib txuas ntawm cov yeeb nkab haum hauv cov kav dej, siv rau kev sib txuas ntawm cov yeeb nkab khoov, siv los hloov cov kev taw qhia ntawm cov yeeb nkab.