adjective [原级] 不易忘怀的，萦绕于心头的
...the haunting calls of wild birds in the mahogany trees. … 桃花心树林中野生鸟类令人难忘的鸣叫。
noun [具体名词] 对（某地的）经常光顾
It keeps haunting Cascadia residents. 它一直困扰着卡斯卡迪亚居民。
verb [vt. 及物动词] （鬼魂）出没；萦绕在……心中；（长期）困扰；（haunt 的现在分词）
No matter, she found that it was an idea that would not down,' but persisted in haunting her. 不管怎样，她发现这是一个不会罢休的念头，它始终萦绕在她心头。
