A proxy is important to an Ajax architecture if you plan to aggregate content from multiple Web services or if you need to enforce a security mechanism on clients connecting to the network.

若想聚合来自多个Web服务的内容或需要在连接到网络的那些客户机上强制施行一种安全机制，那么代理对于Ajax架构而言就愈发重要。

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Therefore, a good material mining plan and an aggregate processing plan should be determined, which often requires a large amount of research.

因此要确定一个好的料场开采方案和骨料加工方案，往往需要进行大量的设计研究工作。

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The central government has tried to aggregate distribution into six regional bodies, but the plan has run into opposition from municipalities, which are reluctant to lose their electricity revenues unless properly compensated.

ECONOMIST: Electricity in South Africa: Power struggle | The