Cov chaw tsim khoom tshwj xeeb hauv kev nres nres ntau tshaj 20 xyoo hauv Hebei Provice, ntau tshaj 15 xyoo kev xa tawm.Guanyida cov khoom siv: nres nres, nres khau, nres disc, nres hauv ob sab phlu, lim.Tam sim no peb cov khoom tuaj yeem npog 99% cov qauv tsheb sib txawv.Peb tsim raws li OE stan...
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