s. of long duration
a. (已持续)长时间的,为时甚久的adv. 长久
1. I haven't seen him in a longtime.
我很久没见到他了。
2. She has been waiting for a longtime for this opportunity.
她已经等待了很久这个机会。
3. They are longtime friends who support each other.
他们是多年的朋友，彼此支持。