Tiaj tiaj daim iav tsom iav, tseem hu ua daim iav tsom iav, yog lub hom phiaj kev ua haujlwm tsom xam nyob rau hauv tag nrho cov cim dav hlau nrog cov nqaj laser. Nws yog ib qho ntawm cov khoom siv tseem ceeb tshaj plaws ntawm cov tshuab laser kos duab.
