Rau qhov hluav taws kub loj, lub qhov rooj iav hluav taws tuaj yeem ua ke nrog qhov hluav taws kub iav muab faib. Lub qhov rooj hluav taws kub iav yog teem rau hauv nruab nrab, nrog kev faib tawm ntawm ob sab, muab faib rau ntawm lub qhov rooj, thiab qhov rooj hauv qhov muab faib.

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