He is truly a heroic figure in theoretical computer science and a role model for his courage and creativity in addressing some of the deepest unsolved problems in science.

他是理论计算机科学领域里真正的英雄；他在解决某些悬而未决的科学问题上的勇气和创造力是人们学习的楷模。

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The greatest strength we have is the heroic kindness, courage, and self-sacrifice of the American people.

我们美国人民最伟大的力量是英雄般的善良，勇气和自我牺牲。

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The greatest strength we have is the heroic kindness and courage and self-sacrifice of the American people.

我们所拥有的最大长处就是美国人民的崇高的善意、勇气和自我牺牲精神。

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"As the last witnesses to the horrors of World War II leave us, it is vital, it is imperative, to keep alive the memory and example of individuals like Raoul Wallenberg, " she said, describing Mr Wallenberg as a man of "moral courage and heroic example".

BBC: Australia gives Holocaust hero Wallenberg citizenship

The heroic resistance of the passengers of Flight 93 and the courage of the firefighters in the Twin Towers are only two scenes from this great human drama.

CNN: Why the Titanic fascinates more than other disasters

But the heroic actions in Pakistan earlier this week reminded all Americans of the extraordinary courage that our military service members and their families demonstrate on a daily basis.

WHITEHOUSE: Mother's Day Tea at the White House