worrywart

1. N-COUNT If you refer to someone as a worrywart, you mean that they worry too much or worry about things that they should not worry about. 杞人忧天的人[非正式]

Some worrywarts have predicted that if the scientists actually do create a new universe, it might destroy the existing one. 一些杞人忧天的人预测说，假如科学家真的能够造出一个新宇宙，它也许会摧毁现存的宇宙。