Daim ntawv thov Lub ntsuas teev teev no yog hom tshuab.Dav siv rau txhua yam ntawm lub tshuab, khoom siv thiab khoom siv (xws li kev tiv thaiv ib puag ncig cov khoom siv hluav taws xob thiab lwm yam).Siv los ua kom pom lub tshuab, cov cuab yeej siv, cov cuab yeej ua haujlwm lub sijhawm sib sau ua ke.Qhov no mechanical type accumululation longest accumululation time can be 11 xyoo.Nws kuj tseem tuaj yeem tswj cov ntaub ntawv tom qab txiav hluav taws xob.