come across
1．cross a road，bridge，etc．穿过（路、桥等）
Don't come across the street when there is heavy traffic．车子多的时候不要过街。
2．find or meet by chance偶然发现或碰到
I came across this old photograph when looking for a book yesterday．我昨天找书的时候，偶然发现了这张早年的照片。
3．arise in mind浮现在脑海中
It came across my mind that I had met her before．我记得以前曾见过她。
A good idea came across my mind．我的脑海中有了一个好主意。
4．give or do what is demanded or requested提供所要求的东西；交出
They'll come across a sum of money．他们将提供一笔钱。
The robber told the girl to come across with her purse．强盗要那女孩交出钱包。
5．succeed in producing a desired effect；be understood and received well by others起到预期的效果；被理解；效果好
The speaker spoke for a long time but I am afraid his meaning did not come across．那位演讲人讲了很久，但是他的意思恐怕没有人会理解。
Your speech came across very well；everyone understands your opinion now．你的发言清楚明了，现在大家都理解你的观点了。