Durable vim li cas:
txhuam hniav
(1) Theoretically hais lus, siv roughly tib lub cav kom ua tiav tib lub luag haujlwm, ntau txoj kev tsim, ntau yam tsis ua haujlwm, thiab cov qauv piggyback nyuaj, yog li nws muaj teeb meem.Hauv kev siv tiag tiag, ib yam nkaus, lub hnab ev ntawv muaj teeb meem.
(2) Los ntawm qhov teeb meem tiag tiag, kev lag luam hauv tsev ntawm cov txhuam hniav yog qhov kev lag luam, uas yog, cov cav tov ruaj khov.Yog li ntawd, kev lag luam hauv tsev yeej tsis siv lub hnab ev ntawv, thiab yuav luag tag nrho lawv yog sab-mounted.