英语翻译He's here because he was tried and convicted beyond a reasonable doubt given the presumption of innocence by a jury of 12 people.什么叫beyond a reasonable doubt呢？还有后面的given修饰的又是什么呢？

英语翻译
He's here because he was tried and convicted beyond a reasonable doubt given the presumption of innocence by a jury of 12 people.
什么叫beyond a reasonable doubt呢？还有后面的given修饰的又是什么呢？

法庭审判了他,并且12位陪审在假设他清白的情况下,毫无疑问地给他定了罪.因此,他现在在这里.