Nco tseg:
1. Thaum ua haujlwm tu thiab kev pabcuam, ua raws li cov txheej txheem kev khiav haujlwm thiab kev tswj xyuas kev nyab xeeb kom muaj kev nyab xeeb ntawm tus kheej thiabkhoom sivkev nyab xeeb.
2. Siv cov cuab yeej thiab cov cuab yeej tsim nyog rau kev tu thiab kho kom tsis txhob muaj kev puas tsuaj lossis raug mob rau cov khoom siv.
3.Reserve tus nqi tsim nyog ntawm cov khoom seem xws li cov ntsaws ruaj ruaj, cov khoom cua sov, thiab lwm yam, kom lawv tuaj yeem hloov tau thaum lub sijhawm khoom siv tsis ua haujlwm.
