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Intermix iav hlaws EN1424
Cov iav hlaws rov tuaj yeem tuaj yeem txhim kho retro-reflection cov cuab yeej ntawm txoj kev npav cim kab. Tsav tsheb thaum hmo ntuj, taws teeb ci rau ntawm txoj kev npav cim nrog cov hlaws dai iav, lub teeb taws teeb tom qab yog rov qab parallelly. yog li tus tsav tsheb tuaj yeem pom txoj hauv kev ua ntej kom pom tseeb, thiab tsav tsheb thaum tsaus ntuj.
