Cov qauv yooj yim, lub suab qis, cov roj me me, muaj zog tus kheej - priming kev ua tau zoo thiab cov yam ntxwv zoo thiab muaj kev kub ceev. Lub twj tso kua mis yog qhov haum rau cov khoom lag luam txuas ntxiv lossis cov lej sib quas ntus hauv cov tshuab tsawg thiab nruab nrab hauv cov roj hluav taws xob tsis tshua muaj zog siv lubrication. Cov khoom yog dav siv nyob rau hauv lub tshuab roj ntawm cov tshuab ntawm cov tshuab ua khoom siv, luam ntawv, luam ntawv, luam tawm, tshuaj lom neeg thiab cov khoom noj ntawm cov tshuab thiab khoom siv.
