偶遇; 碰見; 和…不期而遇

望採納

run into:

1. 撞到，例 run into a wall (撞到牆上)

2. 陷入，例 run into trouble (陷入麻煩)

3. 跑進，例 run into the store (跑進商店)

4. 無意中遇見，例 I ran into her at the party. 我是在派對上無意中遇見她的。

run across:

1. 跑著穿過，例 run across the yard (跑著穿過院子)

2. 無意中找到/遇見，語法類似 run into 的用法4。再給個例子：

I ran across her name in the telephone directory.

我無意中在電話簿裡看見她的名字。