prologue

这场小型冲突成为了全面战争的序幕。

The minor clash acted as a ___prologue to the full-scale war.

这些小冲突是全面战争的序幕。

These minor clashes were the ___prologue to a full-scale war.

小说的序言介绍了故事发生的背景。

The ___prologue of the novel introduces the setting of the story.