Delivery was slow; sending express mail meant waiting in queues.
平信投递速度太慢;寄快件意味着要排很久的队。
Documents enter the system via a document service interface and are placed in queues.
文档通过文档服务接口进入系统并放在队列中。
In queues, the car's electric engine shuts down before restarting when the car moves again.
在行车队列中,电动引擎在汽车重新启动之前可以关闭。
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