Cov khau nres: Nruas nres, haum rau cov tsheb thauj khoom, tsheb npav, thiab lub log tsheb rov qab los ntawm kev lag luam tsheb. Qhov zoo tshaj plaws: Cov khoom siv hnyav, cov nqi qis dua
Cov Xauv Cov Duab: Cov nres tsheb disc, haum rau cov neeg caij tsheb (tshwj xeeb yog pem hauv ntej lub log) thiab cov tsheb ua haujlwm siab. Qhov zoo tshaj plaws cov xwm txheej: kev kub ceev, nquag braking, muaj tej yam cua sov dissipation yuav tsum tau
