haunting

动词 haunt:

1. follow stealthily or recur constantly and spontaneously to
   同义词：haunt, stalk
2. haunt like a ghost; pursue
   同义词：haunt, obsess, ghost
3. be a regular or frequent visitor to a certain place
   同义词：frequent, haunt

形容词 haunting:

1. continually recurring to the mind- Claudia Cassidy
   同义词：persistent
2. having a deeply disquieting or disturbing effect-Charles Lee

1. A haunting melody.
   萦绕心头的旋律
2. Separatism and racial conflict has been haunting the post- cold war community.
   分离主义和种族冲突一直困扰著後冷战时代的国际社会。

haunt.ing

adj.（形容词）
Continually recurring to the mind; unforgettable:
萦绕心头的：经常出现在脑中的；不能够忘怀的：
例句：
a haunting melody.
萦绕心头的旋律

【引伸】
haunt.ingly
adv.（副词）