VOA慢速英语:Women Pilots in World War 2 Program Finally Get Recognition

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