a closed book

　
英 　 　 美 　 　
  • 未揭開(kāi)的秘密,高深莫測的謎

a closed book的用法和樣例：

例句

  1. Fishing is a closed book to me.
    我對釣魚(yú)是一竅不通。
  2. Nuclear physics is a closed book to me.
    核物理學(xué)是我完全不懂的一門(mén)學(xué)科。
  3. Nuclear physics is a closed book to most of us.
    我們大多數人對原子核物理學(xué)一竅不通。

a closed book的相關(guān)資料：

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