1. Cov tub ntxhais roj hmab tiv taus kub, zoo nkauj thiab ruaj khov.
2. Kev nyab xeeb, cov khoom siv tooj liab zoo, txhim khu kev qha thiab ruaj khov.
3C cov khoom siv: cov ntsiav tshuaj, cov khoom siv hluav taws xob, lub tsheb fais fab, lub khob dej ntse.Them cov ntaub ntawv cable.Kev lag luam kho mob: cov cuab yeej kho mob, cov cuab yeej zoo nkauj, hnov AIDS, ntsuas ntshav siab, ntsuas lub plawv dhia, tuav electrocardiograph.Cov cuab yeej ntse: cov neeg hlau ntse, cov khoom siv tes tuav, drones, khoom siv tsheb, thiab lwm yam