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Ib leeg & Ob Chav Hung Qhov rai
Cov lus piav qhia Cov sash ntawm lub qhov rais dai yog qhov loj, nrog cov iav loj loj, uas tsis yog tsuas yog ua kom lub teeb pom kev zoo hauv tsev, tab sis kuj txhim kho tag nrho cov duab ntawm lub tsev.Lub qhov rais dai tau yooj yim rau nruab, thiab lub qhov rooj thiab qhov rais tuaj yeem qhib thiab kaw dawb los ntawm kev maj mam thawb, snapping thiab buckling.Tsis tas li ntawd, cov plua plav pov tseg rau lub sijhawm ntev yuav tsum tau muab tshem tawm thiab ntxuav, yog li lub sash tuaj yeem nqa tau los ntawm kev siv cov cuab yeej kev nyab xeeb thiab tshem tawm ntawm qhov qis dua.Th...
Thov Ib Daim Ntawv Tso Cai Dawb
