是不是我讲的不太详细呢? . Y4 A/ p1 ?$ O: A1 K( g, s2 Twhen the minority carriers density inject into base region approaches the majority cairriers density thereby increaseing the majority carrier charge in the base ,thus reduce the emitter efficiency and beta + ~( \4 y, Y, d; T0 N; Di can't understand it ,would you please help me ,thank you !