Two summers had gone by since the start of the American Civil War, and the North had not yet won a major battle in Virginia.

VOA: special.2009.09.24

and you can't figure it out yet you've gone to doctors they don't know why either.

你没法弄明白，即便你去找医生，他们还是找不出原因。

That's why 课堂 - SpeakingMax英语口语达人