Tag nrho ntawm 1.878 billion tons ntawm cov hlau tau raug tsim tawm thoob ntiaj teb hauv xyoo 2020, nce 9 lab tons hauv ib xyoos, raws li World Iron and Steel Association (WISA) tau tshaj tawm rau lub Rau Hli 4. Ntawm lawv, Tuam Tshoj tseem ua tus thawj coj. ntiaj teb, tsim tau 1.0648 billion ton...
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