LUBKev kho dej hiav txwv yog kev kho mob raws li kev siv dej sab nraud hauv nws daim ntawv ua kua los yog gaseous, thiab ntawm qhov kub thiab txias.

Txhawm rau kho cov teeb meem ncig, nws feem ntau muaj xws li a massage tau siv cov dav hlau muaj zog ntawm cov dej hloov txias ces kub. Qhov no tam sim ntawd activates cov ntshav.