Yog li ntawd, peb yuav tsum nrhiav lub sijhawm, thiab tsis txhob nrhiav teeb meeg. Muaj coob leej txiav txim tau tswvyim. Lawv nrhiav tau lub ntsiab no los ntawm li polytetrafluoroethylene (PTFE). ( Ntawv Nkauj 27: 11). Txawm koj ua phau, luaj phau, lossis phau, ib phau tswv PTFE tseem pab tau ntaus phau