这位时间旅行者突然出现在我们的时代，穿着古怪的未来服饰。

The ___time-traveller suddenly appeared in our era wearing strange futuristic clothing.

科幻电影中的时间旅行者试图阻止一场灾难的发生。

The ___time-traveller in the sci-fi movie tries to prevent a disaster from happening.