2. 专升本
  3. Not until the twentieth century did engineers fully understand the principles of flight that birds have been using for millions

Not until the twentieth century did engineers fully understand the principles of flight that birds have been using for millions

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问题 Not until the twentieth century did engineers fully understand the principles of flight that birds have been using for millions of years.
选项
答案直到20世纪，工程师们才完全弄懂鸟儿千百万年来一直应用着的飞行原理。
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