Dual string provides a new fluid circulation way and accelerates the velocity of liquid quickly, improving the efficiency.
双层管柱提供了新的液流通道，同时加快了携砂液返速，提高冲砂效率。
The water resources system of basin is the complex system of human and natural water circulation, and dual complex character becomes the intrinsic property of water circulation.
流域水资源系统是自然和人工水循环的复合系统，二元复合特性成为水循环的固有属性。
Part II describes the dual economic system's circulation and constructs the theoretical model of agricultural surplus labor transfer.
其二是在描述二元经济体系运行的基础之上，构建农业剩余劳动力转移的理论模型；
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