osa muaj hnub nyoog thiab osa loj

Xyooj

Ib qho tseem ceeb ntawm cov hnub qub tseem ceeb rau cov kws saib hnub qub yog Ursa Minor. Nws nyob hauv sab qaum teb hemisphere thiab ...

chaw ntub dej

Dej hiav txwv

Ntawm cov txheej txheem ntuj ib txwm muaj ntawm kev muaj txiaj ntsig zoo hauv ecological thiab kev saib xyuas ntawm biodiversity, yog thaj av ntub. Lub hom phiaj txhua xyoo ...