Tsuas yog ib qho kev tawm xwm txheej ceev tau teeb tsa hauv txhua qhov kev faib ntawm cov tsev siab. Txij li cov qhov rooj hluav taws tsuas tuaj yeem qhib rau hauv ib qho kev taw qhia, yog tias ob qhov chaw nyob ib sab tsuas muaj ib qho kev tawm thaum muaj xwm txheej ceev, ob lub qhov rooj hluav taws yuav tsum tau muab tso rau ntawm qhov hluav taws kub thiab qhib rau ob tog raws li qhov xav tau ntawm kev khiav tawm ntawm ob qhov kev faib tawm.

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