有很多
【boundary】Scientists continue to push back the boundaries of human knowledge
【confines】It's beyong the confines of human knowledge
【limits】
【state】She's in a state of permanent depression
【realm】At the end of the speech he seemed to be moving into the realms of fantasy.
【level】Fables can be understood on various levels.
我例句都给了,你自己选一个吧,不过个人觉得最对的其境界二字的是Realm和Level