adj (usually before a noun 通常用于名词前) 1 moving in two different directions; allowing sth to move in two different directions 双向的；双行的: two-way traffic 双向交通
2 (used about communication between people 指人际交流) needing equal effort from both people or groups involved 双方的: Friendship is a two-way process. 友谊是双方的事。
3 (used about radio equipment, etc 指无线电器材等) used both for sending and receiving signals 收发两用的