5 Raw Materials Nyob rau hauv ob peb lub xyoo dhau los, cov khoom siv raw kev lag luam tau dominated los ntawm kev tsim kho tshiab, high tech, complex thiab tshwj xeeb raw cov ntaub ntawv. Nws yeej tsis txaus, ib yam li kev lag luam, n...
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