Kub dabtsi yog khoov 6H composite khoom zaj duab xis;nws yog ib tug tshiab technology tiv thaiv zaj duab xis nyob rau hauv kev lag luam, nrog dawb nto 6H hardness, 3D tiv thaiv nyhuv, yooj yim filming, ntev kev pab cuam lub neej, thiab lwm yam. Qhov tsuas drawback tam sim no yog lub peev xwm ntau lawm, thiab tsuas yog ib tug me me ntawm cov neeg siv khoom. m...
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