1. Kev sib txawv ntawm kev lag luam ntim cov hnab yas tig los ntawm keeb kwm ntawm cov hnab yas, peb yuav pom tias cov ntim yas muaj keeb kwm ntau tshaj 100 xyoo.Tam sim no nyob rau hauv lub xyoo pua 21st, kev tshawb fawb thiab thev naus laus zis txuas ntxiv txhim kho, cov ntaub ntawv tshiab thiab cov thev naus laus zis tshiab txuas ntxiv mus, poly ...
Nyeem ntxiv