他努力了解这个年轻人的动机，但就是弄不清楚。
He tried to get a fix on the young man's motives, but he just couldn't understand him.
他与一个有名的女子关系非常密切，而且目前尚不清楚他有多么了解她，但人们说他与她的事情。
He had a very close relationship with a famous women and it is not clear how well he knew her, but people speak of his affair with her.
我知道有些人有做过搜索引擎优化，但是我不了解这方面的东西，我也不清楚具体的细节。
Eugene: I think there are people who do this, but I don't know it. I don't know all the details.
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