Kuaj Sieve

Kuaj cov sieve yog cov hlau sieve uas tau thov rau kev kuaj sim thiab ntsuas qhov loj me. Nws feem ntau suav nrog cov hlau tsis xeb hlau ntxaij vab tshaus tuav hauv cov kab hlau puag ncig. Nws tau tsim los muab kev xav tau meej thaum lim tawm cov khoom tsis xav tau los ntawm cov khoom kawg. Kuaj cov sieve tuaj hauv ntau qhov ntau thiab tsawg thiab ua kom tau raws li qhov kev tshuaj xyuas ntawm ntau yam kev lag luam. Nws tau siv dav hauv kev lag luam cuam tshuam nrog kev faib cov hmoov thiab cov khoom lag luam, xws li tshuaj lom neeg, tshuaj thiab tshuaj lag luam