great white whale
definitions
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a large whale, often used metaphorically to represent a formidable challenge or enemyzh: 一种大型鲸鱼,常用来比喻难以对付的挑战或敌人
examples
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Moby Dick is the great white whale that haunts Captain Ahab's dreams.
莫比·迪克是困扰亚哈船长梦境的那只大白鲸。