Dab tsi yog 20 feeb hluav taws xob tawm ntawm lub qhov rooj?

Hlau lub qhov rooj nrog a 20- scehipe daim tawv tau yuav hais rau muaj a 20-} feeb tso tseg kev ntaus nqi. Rau tej yam tshwj yim, ntuas tus tso tseg kev ntaus nqi ntawv nplaum saum tus lub qhov rooj nws tus kheej. Ua tsis xav tias muaj uas tag nrho hlau lub qhov rooj yog Hluav Taws-Rated. Ntau tshaj plaws lub tsev cim toob kas uas a Hluav Taws-Rated lub qhov rooj yog nruab nruab nrab tus lub tsev thiab tus chav nres tsheb.