Lub luag haujlwm tseem ceeb ntawm lub qhov rooj tua hluav taws yog tiv thaiv hluav taws, thiab nws lub sijhawm tiv thaiv hluav taws tuaj yeem ncav cuag ntau tshaj 3 teev. Lub qhov rooj tua hluav taws yog cov khoom siv hluav taws xob. Kev ua haujlwm txhua hnub yog qhov yooj yim heev. Nias lub nce, nqis thiab nres cov nyees khawm ntawm lub thawv tswj kom tswj kev nce thiab nqis ntawm lub qhov rooj tua hluav taws.

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