Lus cev lus tseem ceeb heev nyob rau hauv lub neej txhua hnub, nyob hauv txoj kev sib txuas lus, hais ib leeg yog tsis txaus. Peb yuav tsum tau siv lub cev lus luag yog ib yam ntawm lub cev lus tau kev qhia cov phooj ywg, zoo siab; hauv ib cheeb tsam nrov, yog hais tias koj xav kom ua rau luag lwm tus nkag siab txog cov ntsiab lus, nrog rau ib tug taw yooj yim piav txog qhov teeb meem. Yog peb lub neej inseparable cov lus cev ntawm cov pas dej, cov reservoirs thiab cov niam dej rau qhov muaj feem thib Woo-Vuvuzela
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