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