As an American, I indeed know.

作为一个美国人，我当然知道。

youdao

Indeed I know how much he disliked me and how he enjoyed speaking ill of me.

的确，我知道他是多么讨厌我，多么喜欢说我的坏话。

youdao

Indeed, I have been a complete ass, and I know it.

的确，我是个十足的蠢驴，这我知道。

youdao

I think they're very heavy, indeed, but I don't know how much they weigh.

他们负重确实很多,但是我不知道他们的负重是多少

耶鲁公开课 - 古希腊历史简介课程节选

I look at something and I know what it is, forgetting that possibly I only know what it is because of a context in which indeed it is not those other things that are linked to it.

而我认知一样东西，很可能并不知道它的本质是什么,而是以它和其他事物的,关系来认知它。

耶鲁公开课 - 文学理论导论课程节选

Indeed I know at least one person who writes for it and I feel pretty safe in saying that their intellectual capabilities comfortably surpass my own.

FORBES: Yet Another Example of The Economist's Awful Russia Coverage

Indeed, I know a family whose newborn daughter had a defective heart and had to have a heart transplant.

FORBES: ObamaCare's Campaign of Misinformation

Indeed, I know of no basis other perhaps than wishful thinking for positing a connection between the presence or absence of U.S. testing and global proliferation.

CENTERFORSECURITYPOLICY: Freedom Flame 2013