The cold was unbelievable.
天气冷极了。
The pressure they put us under was unbelievable
他们给我们施加的压力之大超乎想象。
I find it unbelievable that people can accept this sort of behaviour
人们竟能接受这样的行为，我震惊不已。
I know it sounds unbelievable but I never wanted to cheat.
我知道听上去难以置信，但我从不想撒谎。
I still find this story both fascinating and unbelievable
我仍觉得这个故事既有趣又不太可信。