I have lost a friend.

我失去了一位好朋友。

youdao

He was right, but I still felt as if I'd lost a friend.

他所言极是，但我始终觉得我失去了一位挚友。

youdao

You leave let me feel very sad, because I lost a friend in Vancouver.

你的离开我很伤心，因为在温哥华我失去了一个朋友。

youdao

He greets Socrates, in many ways, as a long, lost friend.

他招呼苏格拉底，从很多层面看来像是很久不见的老友。

耶鲁公开课 - 政治哲学导论课程节选

Adam, 32, who does not want to use his real name, lost a friend over a lack of plus one.

BBC: The plus-one wedding invitation dilemma

Those who discovered him after his death feel like they lost a friend, said one such fan, Marie A. Jost.

NPR: Fans Mark 10th Anniversary Of Leslie Cheung Death

When one of my literary heroes, Barry Unsworth, died on June 5, I felt as though I had lost a friend.

WSJ: A Tribute to Barry Unsworth | Dear Book Lover