一搭一档

Explanation: That complement each other, collaborate with each other. Sometimes with derogatory implications. 　　Source: Zhou Libo, "summer night" two friends a ride of a file that many sarcastic words of the song is actually dig the song but because it aroused the sad people. " 　　Examples: They both are so echoed each other on any occasion, ~, act in harmony. ★ Jiang Zilong "Read Me a female engineer"