It was a turning point in American history.

这是美国历史上的一个转折点。

This was an important event in American history.

这是美国历史上的一个重大事件。

It's the longest war in American history.

这是美国历史上最长的战争。

It was the longest shutdown in American history.

这是美国历史上最长的关闭。

It was the blackest day in American history.

那是美国历史上最黑暗的日子。

I have this, uh, American history paper due Monday.

我有个美国历史的论文要周一交。

So this is an American history exercise on Khan Academy.

所以这是可汗学院的美国历史练习。

It's the largest such programme in modern American history.

这是美国现代史上最大的提振项目。

This was the worst mass shooting in modern American history.

这是美国现代史上最严重的枪击事件。

He has lived longer than any president in American history.

他比美国历史上任何一位总统都长寿。

Hatch was the longest serving Republican senator in American history.

哈奇是美国历史上任职时间最长的共和党参议员。

It was Hurricane Katrina -- one of the worst natural disasters in American history.

那是卡特里娜飓风，美国历史上最严重的自然灾害之一。

The nineteen thirties was named the " Jazz Age" in American history.

二十年代被称为美国历史上的“爵士乐时代”。

But they was about to change the course of American history.

但美国历史的进程即将改变。

Well, for starters, that generation is the biggest in American history.

嗯, 首先, 这一代有着美国历史上最大的人数。

But each step in American history forward produces a half-step backward.

但美国历史上每向前走一步，就会倒退半步。

This is the anniversary of the tragic day in American history.

这是美国历史上那悲剧一天的周年纪念日。

It was the largest release of its kind in American history.

这是美国历史上最大规模的囚犯释放。

It's like nothing, frankly, we have seen in American history.

坦白说，这是我们在美国历史上从未见过的。

It was one of the largest corporate bankruptcy claims in American history.

这是美国史上最大的企业破产案例之一。