How did he come across? [=what kind of impression did he make?]他给人的印象如何？

He comes across as (being) a good speaker. [=he seems to be a good speaker; people think that he is a good speaker when they hear him talk]他给人能说会道的印象。

He came across as a nice guy. [=he seemed to be a nice guy]他看上去是个好人。

She says she was trying to be helpful, but that's not what came across when I talked to her. [=I did not get the feeling that she was trying to be helpful when I talked to her]她说她当时在尽力帮忙，但我与她交谈时并没有这种感觉。

Her enthusiasm really came across [=came through] when she talked about her job. [=we could see that she was really enthusiastic when she talked about her job]谈起她的工作时，她表现出极大的热情。

Researchers have come across important new evidence.研究者无意中发现了重要的新证据。

As I was walking through the town, I came across a group of street performers.我在小镇穿行时偶然碰到一群街头艺人。

They threatened to hurt him if he doesn't come across (with the money).他们威胁他说，如果不把钱交出来就让他尝尝苦头。