In this paper, the queue model of multi-windows and mixed system is presented based on the theory of queue. The all digital and multi-function queue machine is designed.

本文在排队理论的基础上，提出了多窗口混合制的排队模型，设计了全数字、多功能排队机。

youdao

In theory, there is a long queue of coal-fired power stations waiting to be built in America.

ECONOMIST: A survey of The future of energy