(2) 表示“交叉”时的用法比较：

The roads cross just outside the village. 那两条路就在村外交叉。

He sat there with his arms across his chest. 他坐在那儿，两臂交叉放在胸前。(介词用法)

4. 用于习语come across，主要用法有：

(1) 偶然遇见，碰见(=run across)

Where did you come [run] across her? 你在那儿碰到她的?

I’ve just come across a beautiful poem in this book. 我在这本书里偶然发现一首优美的诗。

(2) 被理解，被传达(=come over)

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。

(3) 使人产生某种印象(=come over)

Your speech came across very well. 你的演说相当受欢迎。

He came across as sympathetic / a sympathetic person. 他给人以有同情心的印象。

注意以下用法，它不是习语，其中的across为副词，表示“在另一边”：

Come across to my office this afternoon. 你今天下午到我办公室来一趟。

高中高二英语知识点：介词 across用法全解就为大家整理到这里了，希望能帮助到大家!