I ascertain me misspeak or being joking.

我确定我没有说错话或是在开玩笑。

If you misspeak, and catch your mistake, immediately correct yourself by repeating the sentence correctly.

如果你说错了，逮住你的错误，立即纠正自己的错误，把这个句子正确地再说一遍。

On Tuesday, Clinton told a news conference that the long grind of the presidential campaign had caused her to misspeak about the circumstances of the visit.

克林顿星期二在记者会上说，在旷日持久的竞选活动的压力下，她在描述那次访问情形的时候说错了话。