1. Nws tuaj yeem txheej txheem ntau yam khoom siv hlau thiab tsis yog hlau. Tshwj xeeb tshaj yog rau siab tawv, siab melting point, khoom nkig, cim yog qhov zoo dua.
2. Nws yog los ntawm kev tsis sib cuag, tsis ua rau cov khoom puas, tsis muaj cov cuab yeej hnav, thiab muaj cov cim zoo.
3. Lub nqaj hlau laser yog nyias, cov khoom siv ua khoom noj yog me me, thiab thaj chaw ua haujlwm cuam tshuam los ntawm tshav kub yog me me.
4. Kev ua haujlwm siab, kev tswj hwm lub computer, yooj yim kom paub siv lub tshuab.
