了解这个家族的背景故事后，我终于明白为什么他们对遗产如此执着。

After learning the ___back-story of this family, I finally understood why they're so obsessed with the inheritance.

这部电影的幕后故事解释了主角为何会有如此奇怪的行为。

The movie's ___back-story explains why the main character behaves so strangely.