这句话怎么翻译(距离考试只剩下20天了)

呵呵，不要按照字面翻译，只要把内在的意思翻译出来就好了：

We just have 20 days to prepare for the college entrance examination。

Only 20 days to the examination day.

Distance examination left 20 days

There are only 20 days left to the test.