在另一个现实中，人类进化出了翅膀。

In an ___alternate reality, humans evolved with wings.

如果恐龙没有灭绝会怎样？这部小说探索了这个平行宇宙。

What if dinosaurs never went extinct? This novel explores that ___alternate reality.

在科幻电影中，主角常常穿越到一个与现实不同的平行世界。

In sci-fi movies, the hero often travels to an ___alternate-reality where things are different.