Recess nyob rau sab ntawm lub log tsheb
Qee lub sij hawm muaj banded sab hauv kev nyuaj siab nyob rau hauv radial kev taw qhia ntawm lub log tsheb. Qhov no yog cov khoom ntawm cov qauv sab hauv. Tsis muaj teeb meem kev nyab xeeb thiab nws tuaj yeem siv tau ib txwm.
