Lub ntsiab nta:
Kev ua haujlwm siab ntxiv tiv thaiv, tsis kam tiv thaiv, tiv thaiv hluav taws xob tsis muaj zog, tiv thaiv hluav taws xob, tshem tawm hluav taws xob zoo li qub, huab cua muaj zog permeability, paj rwb sab tuaj yeem kov cov tawv nqaij ncaj qha.
Daim ntaub ntawv:
Cov khoom txig zoo rau kev tiv thaiv, tiv thaiv hluav taws xob, hnav tsoos tsho, khoom ntxiv thiab textiles hauv tsev; cov khoom uas coj ua, cov khoom lag luam zoo li qub.
