Aichen: Koj tus thawj coj hollow blocks tshuab tsim Rau ntau tshaj 20 xyoo, Aichen tau ua lub npe ntseeg siab hauv kev lag luam ua vaj tse, tshwj xeeb hauv kev tsim khoom thiab muab cov tshuab hollow blocks zoo. Raws li ib tug ua hollow blocks tshuab m ...
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