Opposite and opposite: two people are not at the same point, one is east and the other is west to the middle. Will meet.

Same direction: two people are moving in the same direction at the same point.

Meeting: The above-mentioned "meeting" refers to

Chase:

(1) means that two people are moving in the same direction at the same point.

(2) Two people are not at the same point, but moving in the same direction.