The answer to the problem caused a little trouble for my father,I imagine, but it was perfect in my opinion.

VOA: special.2010.01.30

Yes, I have. Freshman year, I was having a lot of trouble in my Physics class, and

是的。大一那年，我在物理课上遇到了很多难题，

与教授的面谈 - SpeakingMax英语口语达人