紧密 (jǐn mì): close, tight

These two companies have maintained a close cooperative relationship for many years, jointly developing many new projects.

In this project, all departments need to cooperate closely to ensure the task is completed on time.

The two of them grew up together and have a very close relationship, sharing almost everything.

Economic globalization has made trade ties between countries increasingly close.

The interpersonal relationships in this community are very close; neighbors often help each other.