Extraterrestrial life has often become the subject of sciencefictionfilms.
科幻片经常以外星生命为主题。
2
Time machines are commonly seen in sciencefictionfilms and books, but no one knows how to build one.
时间机器在科幻电影和书籍中经常见到，但是没有人知道怎样制造出一台。
3
It was another film idea based on sciencefiction. But they eventually stopped that project because, as they said, 'We don't think there's a market for sciencefictionfilms.'