C1 the condition of being alone, especially when this makes you feel unhappy隔离;分离;孤独
The prisoner had been kept in isolation for three days.这个犯人已被隔离3天了。
After all the visitors had left, she experienced a feeling of complete isolation.所有的客人离开后,她有一种异常孤独的感觉。
C2 the fact that something is separate and not connected to other things孤立
I can't think about it in isolation (= separately) - I need some examples of the problem.我无法孤立地考虑这个问题——我需要一些例子。