across: from one side to the other (在平面上)越过,在/到……对/面,横过。 I can’t swim across the river. 我不能游到河对岸。 He went across the hall to the door. 他越过大厅到门口。 over: 翻越过 across和over两者都表示从一侧向另一侧的运动: She drove over /across the bridge. 但如果越过的是一个高的物体,则用over: He climbed over the wall. 如果越过的是一个平面,则宜用across: He went across the hall to the door.如果第一句话用over the grass那就是从草里面走了