Annulus iav, tseem hu ua lub nplhaib iav, yog lub voj voog nrog cov hniav ntawm sab hauv ntug. Lawv cov qauv tsim tshwj xeeb ua rau lawv haum rau ntau yam kev siv uas qhov kev hloov pauv hloov pauv yog qhov tseem ceeb.
Annulus gears yog ib qho tseem ceeb ntawm cov gearboxes thiab kis tau tus mob nyob rau hauv ntau yam machinery, nrog rau cov khoom siv, siv machinery, thiab tsheb ua liaj ua teb. Lawv pab xa hluav taws xob zoo thiab tso cai rau kom txo qis lossis nce ntxiv raws li xav tau rau cov ntawv thov sib txawv.