1.She believed that training women to serve as support pilots at home could free up men to fly combat operations overseas.

free up释放，空出来

2.In all, they flew more than ninety-six million kilometers.

in all总共, 合计;总之

例句：There are fifteen books on the first shelf, twenty-one on the second, that makes thirty-six in all.
      书架的第一层有15本书, 第二层有21本, 总共是36本。

3.The United States is now in its tenth year of war -- longer than any other time in American history.

longer than any other用比较级表示最高级

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