1. 等待线：waiting line theory 排队论 | waiting line 等待线 | waiting on cement 候水泥凝固

2. 队列：wait status 等待状态 | waiting line 队列 | waiting line model 等待队列模型

3. 等候线：Wait on curb 路边停等 | Waiting line 等候线 | Waiting time 等车时间;等待时间

4. 等候线;排队：等候线;排队 waiting line | 等候室 waiting room | 等候系统 waiting system

noun

1. a line of people or vehicles waiting for something

Synonym: queue