Run across
偶然遇到；跑着穿过
I never thought that I could run across him in the street.
我从来没想过我能在街上偶然遇见他。
Don’t run across the street.
不要跑着穿过马路。
Run after
追求；追赶
She is running after Johnny.
她在追求约翰尼。
The hunting dog is running after a hare.
猎犬正在追赶一只野兔。
Run against
与…相撞; 违反；不利于; 与…竞选
This policy is running against a lot of people.
这项政策对很多人不利。
Mark is going to run against his old friend in the election.
马克将在选举中与他的老朋友竞选。
The boy hurt his foot by running against a stone.
那男孩撞在石头上，伤了脚。
