come across偶然遇见/发现,被理解
1.(偶然地)碰到；(可以是人，也可以是物，还可以是偶然读到一篇文章等抽象的东西。）
She came across some old photographs in a drawer.
她在抽屉里偶然发现一些老照片。
We came across an old man lying in the road.
我们遇到一个躺在地上的老人。
When I come across a good article in reading newspapers, I often want to cut and keep it．
当我在报上读到一篇好文章时，我经常想剪下来留着。
Whatever difficulties we may come across,we ill help one another to overcome them.
无论遇到什么困难。我们都要彼此帮助一起克服。
2.忽然想到
A strange idea came across her mind.
她脑海里出现一个奇怪的想法。
3.被理解 sth come across (主动表被动意思）
He spoke for a long time but his meaning did not really come across.
他讲了很长时间，但他的意思没有人真正理解。
4.[口语]看上去似乎是，给人…印象：
He came across to me as being quite a nice persom.
他在我的印象中是一个挺好的人。