Qhov zoo ntawm cov khoom lag luam hlau tau ua rau tib neeg lub cim, ua ntej siv cov tshuab sib tw uas muaj peev xwm txhim kho cov hlau nplaum sib tw los txhim kho cov hlau nplaum hlau tuag .
Cov khoom lag luam hlau ua kom zoo nkauj, ua ntej, cov qauv siv hlau ua kom tau zoo, cov qauv siv hlau ua kom tau zoo, cov qauv hlau ua kom tau txais txiaj ntsig zoo, thiab cov qauv tsim ntawm hlau stamping tuag yuav tsum tau hais txog.
Kev tsim qauv ntawm cov hlau stamping yuav tsum tau muaj ntau yam, cov qauv kev nyab xeeb ntawm cov hlau stamping tuag, yog li kev txhim kho hlau stamping tuag saum npoo av, yog li kev txhim kho hlau stamping tuag saum npoo av, yog li kev txhim kho cov hlau stamping saum npoo av, yog li kev txhim kho hlau stamping tuag saum npoo av, yog li kev txhim kho hlau stamping tuag saum npoo av, yog li kev txhim kho hlau stamping tuag,
Kev tsim khoom lag luam ntawm cov hlau stamping kuj tseem yog ib feem tseem ceeb ntawm kev txhim kho cov stamping tuag thiab kev saib xyuas ntawm kev siv hlau tsis raug thiab txij nkawm, kev pabcuam lub neej ntawm cov hlau stamping tuag yuav ua kom luv . Yog li no, kev tshuaj xyuas ib txwm muaj peev xwm ua kom muaj kev ua kom tau cov khoom siv tau tshaj {4}
