1.b> , , , ; i> / i> ; persistence and courage are wonderful qualities ; it was her sheer persistence that wore them down in the end ;
2.b> 1) , , ; the persistence of a number of crustaceous types ;
2) / , ; the persistence of a high temperature in the patient puzzled the doctor / ;
3.b> .i> 1) / ; persistence of an impression / of vision / ;
2) ; screen persistence .i> ; .