across 从物体表面穿过eg.walk across the road
through 从物体内部传过eg.go through the tunnel
over 在物体的正上方eg.There is a light over your head.
across 从物体表面穿过eg.walk across the road
through 从物体内部传过eg.go through the tunnel
over 在物体的正上方eg.There is a light over your head.