Kev lag luam xov xwm
Nws muab kev lees paub muaj zog rau cov neeg siv kom paub ruaj ruaj batch txiav ntawm tuab daim hlau rau lub sijhawm ntev
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Dab tsi yog qhov zoo thiab tsis zoo ntawm laser txiav
Ib yam li cov lus hais mus: txhua npib tau ob sab, yog li lub laser txiav. Piv nrog cov kev txiav tsoos technologies, txawm hais tias lub tshuab txiav laser tau siv ntau yam hauv kev lag luam hlau thiab tsis muaj kev lag luam thiab tswj hwm thiab cov khoom lag luam feem ntau ...Nyeem ntxiv
