moving in two different directions; allowing sth to move in two different directions 双行的；双向的◆two-way trade 双向贸易
involving two people or groups 双方的◆a two-way battle for ownership of the company 双方争夺公司所有权的斗争
(about communication between people) with each person or side playing an equal role （人际交流）相互的，彼此的◆They maintain a two-way dialogue with their customers through their website. 他们通过网站与顾客保持双向对话。