Xov Xwm Kev Lag Luam
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Qhov sib txawv ntawm txhuam carbon & txhuam hlau npleem nplhaib
Ua ib lub tuam txhab tsim khoom siv slip ring ntau tshaj 15 xyoo, Ingiant paub txog keeb kwm ntawm cov thev naus laus zis slip ring zoo heev. Hnub no peb xav qhia txog...Nyeem ntxiv