Xov Xwm Txog Lub Tuam Txhab
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Yuav ua li cas los ntsuam xyuas qhov kev soj ntsuam?
Yog tias nws yog lub tshuab kuaj hluav taws xob, nws tuaj yeem pom seb puas muaj qhov tam sim no attenuation hauv qhov loj tam sim no kis ntawm lub tshuab kuaj, thiab seb puas muaj pin jamming lossis tawg pin thaum lub sijhawm xeem me me. Yog tias qhov kev sib txuas tsis ruaj khov thiab qhov kev xeem tawm i...Nyeem ntxiv
