Lub qhov rooj hluav taws yuav tsum tau nruab nrog lub qhov rooj hluav taws los ze zog, los yog lub qhov rooj kaw qhov rooj uas tso cai rau lub qhov rooj hluav taws uas ib txwm qhib kom kaw lub qhov rooj ntawm qhov rooj thaum muaj hluav taws (tshwj tsis yog siv rau hauv qhov tshwj xeeb, xws li cov yeeb nkab ncej qhov rooj, lwm yam).

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