Txhawm rau kom tsis txhob muaj tib neeg txoj kev noj qab haus huv raug hem, cov khoom ntim hauv lub qhov rooj ntoo yog cov khoom tsis muaj tshuaj lom thiab ib puag ncig-phooj ywg hluav taws kub rwb thaiv tsev, uas tsis tsuas yog txo cov nqi tsim khoom, tab sis kuj ua tiav kev txuag hluav taws xob thiab kev tiv thaiv ib puag ncig. Qhov hluav taws kub tsis kam ntawm lub qhov rooj ntoo hluav taws yuav tsum tsis pub tsawg tshaj 0.6 teev.

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