难题的英文怎么写，我遇到了一个难题用英文怎么说

1

十四岁的时候，我遇到了一个难题。

When I was fourteen, I had my first big dilemma.

2

我遇到了一个难题：我常常担心考试结果，经常考完试后好几天都在想这个问题。

I had a problem: I always worry about the examination results, often after examination for several days after in to this.

3

这天，我坐在窗前，依旧像往常一样写作业，可是还没写多少，我就遇到了一个难题。

This day, I sat at the window, still as usual writing homework, but haven't write how many, I faced with a puzzle.