1. The catastrophist believes that the world is doomed and that an apocalyptic event is imminent.
灾变论者认为世界注定要毁灭，而且世界末日事件即将发生。

2. As a catastrophist, he always sees the worst case scenario and prepares for the worst.
作为一个悲观主义者，他总是看到最糟糕的情况，并为最坏的情况做好准备。