【正确答案】：
THE WHITE WHALE, MOBY DICK, SYMBOLIZES NATURE FOR MELVILLE, FOR IT IS COMPLEX, UNFATHOMABLE MALIGNANT, AND BEAUTIFUL AS WELL. FOR THE CHARACTER AHAB, HOWEVER, THE WHALE REPRESENTS ONLY EVIL. MOBY DICK, IS LIKE A WALL, HIDING SOME UNKNOWN, MYSTERIOUS THINGS BEHIND. FOR THE AUTHOR, AS WELL AS FOR THE READER AND ISHMAEL, THE NARRATOR, MOBY DICK IS STILL A MYSTERY, AN ULTIMATE MYSTERY OF THE UNIVERSE, INSCRUTABLE AND AMBIVALENT, AND THE VOYAGE OF THE MIND WILL FOREVER REMAIN A SEARCH, NOT A DISCOVERY, OF THE TRUTH. 
【题目解析】：本题考查《白鲸》中白鲸对于不同角色的象征意义。建议分不同角色进行独立分析，并最后进行总结。对梅尔维尔来说，白鲸象征着自然，因为它复杂，深不可测，邪恶，美丽。然而，对于亚哈这个角色来说，鲸鱼只代表邪恶。白鲸就像一堵墙，背后隐藏着一些未知、神秘的东西。对作者、读者和叙述者伊希梅尔来说，白鲸仍然是一个谜，宇宙的终极奥秘，神秘而又矛盾，心灵的旅程将永远是对真理的探索，而不是发现。