Peb twb tsis qhia nws zaj lus tas nrho tej zaum thiab fais fab ntawm lasers. Thaum peb siv lawv txhua txhua hnub, specializing nyob rau hauv laser kawm tuab si lug, peb txhawb lawv siv nyob rau hauv tej lag luam, tshwj xeeb tshaj yog yog hais tias nws yog rau tus txiv neej lub pab. Thaum koj xav seb lasers, cas koj xav seb cov huab cua zoo li? Yog hais tias tsis, tej zaum koj yuav tsum tau ... English… nyeem ntxiv »
