1. Ua tau ntau yam hlau, cov khoom siv tsis yog xim hlau. Qhov tshwj xeeb tshaj plaws, kos npe ntawm kev kub ntxhov, siab melting point, thiab cov khoom tsis zoo yog qhov zoo dua.
2. Cov neeg tsis sib cuag, tsis muaj kev puas tsuaj rau cov khoom, tsis muaj cov khoom siv, thiab lub cim zoo.
3. Lub nqaj laser zoo, kev ua cov khoom noj khoom haus me me, thiab kev ua haujlwm ntawm tshav kub yog qhov me me.
4. Kev ua haujlwm siab, kev tswj xyuas computer thiab yooj yim automation.
