1. Tus neeg xyuas pib txuas zoo;
2. Txhim khu kev rwb thaiv tsev, nws raug nquahu kom siv cov hluav taws xob sib txuas sib txuas hluav taws xob-shrinkable silicone roj hmab rwb thaiv tsev khoom;
3. Zoo sealing;
4. Muaj zog txhua yam, muaj peev xwm hloov mus rau ntau yam kev ua haujlwm.
