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. 杞人憂天的人[非正式]

Some worrywarts have predicted that if the scientists actually do create a new universe, it might destroy the existing one. 一些杞人憂天的人預測說，假如科學家真的能夠造出一個新宇宙，它也許會摧燬現存的宇宙。