Yog vim li cas vim li cas cov khaub ncaws cua sov daim ntawv them cov khoom muaj nqis tsis teeb.
1. Ua los ntawm kev sib cuag tsis zoo ntawm lub hwj chim ntsaws ntawm lub hwj chim bank thiab lub hwj chim mov.
2. Yog tias cov khoom muaj nqis them poob lawm, hloov cov khoom muaj nqis them.
