6.the events from 1945 to 1956 provided the prologue to the post-imperial era.
1945到1956年发生的一系列事件拉开了后帝国时代的帷幕。
7.The Prologue is all that precedes the Parode of the chorus; an Episode all that comes in between two whole choral songs; the Exode all that follows after the last choral song.