1 sentence

1. 星际旅行一直是科幻小说的热门题材。

   xīng​jì lǚ​xíng yī​zhí shì kē​huàn xiǎo​shuō de rè​mén tí​cái.

   Interstellar travel has always been a popular theme in science fiction.

   Source: Dong Chinese Dictionary