Kev lom zem mos mos cov khoom ua si sab hauv tsev rau tsev

SPIRIT tsim cov cuab yeej ua si sab hauv tsev rau tsev hauv Suav teb tshaj 20 xyoo.

Cov khoom siv ua si sab hauv tsev rau hauv tsev feem ntau yog rau menyuam yaus 2-5 xyoo.

Tag nrho peb cov khoom siv ua si sab hauv tsev ua los ntawm PU tawv thiab daim txhuam cev ua npuas ncauj.

Qhov saum npoo ntawm cov khoom siv hauv tsev ua si rau hauv tsev yog mos thiab du.