你办美国过境签证的理由是什么？

Why do you apply for American transit visa?

过境签证情况：是否持有目的地国家入境签证？

In case of transit: Do you have an entry permit for the final country of destinations?

我已经通过了过境签证，可以离开机场了，对吗？

I have got a transit visa and I can go out of the airport, right?