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CR39 Cov tsom iav dub
Cov tsom iav dub yog ib yam khoom siv los saib xyuas qhov muag kom tiv thaiv kev puas tsuaj rau tib neeg lub qhov muag los ntawm lub hnub ci muaj zog. Nrog kev txhim kho ntawm tib neeg cov khoom siv thiab kab lis kev cai, cov tsom iav dub tuaj yeem siv ua cov khoom siv tshwj xeeb rau kev zoo nkauj lossis tus kheej tus cwj pwm.
