Cov ntsia hlau, raws li qhov tseem ceeb fasteners hauv kev tsim kho, rooj tog zaum, kev ua haujlwm ntoo, thiab kev tsim khoom, tau ntsib cov kev hloov pauv tseem ceeb hauv xyoo tas los no vim kev txhim kho kev lag luam thoob ntiaj teb thiab kev txhim kho thev naus laus zis. Tsab ntawv xov xwm no yuav txheeb xyuas qhov tam sim no lub zog ntawm kev lag luam ntsia thawv thiab nws lub peev xwm f ...