dunno /dʌˈnəʊ/

• 1. 

  Dunno is sometimes used in written English to represent an informal way of saying "don't know." 不知道 (有时用于书面语表示非正式说法)

  例：

  "How on earth did she get it?"—"I dunno."

  “她究竟是如何弄到它的？”—“我不知道。”