寻找更多土地的成本代价令人难以接受。
在今天的受益人已经离开很久了后，高额增长的成本代价才被未来的人感觉到。
Most often the costs were perceived to accrue in some distant future long after today's beneficiaries have left the scene.
设计目的是取得在成本代价、负载均衡、等待时间以及系统效率等综合指标上的优化。
The design goal is to obtain some better comprehensive targets, such as cost price, load balance, waiting time and efficient of systems.
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