This paper presents a case of network which is achieved by VPN technology. The case sufficiently shows that VPN application system has lower cost and high security.

介绍了一个利用VPN技术实现的网络系统应用实例，充分体现VPN应用系统低成本和安全的特点。

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The security cost consists of the system reserve cost, the rescheduling cost and the expected system instability cost.

安全成本由备用成本、再调度成本和期望失稳损失组成。

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The entire system is of high security and features high degree of independence, low cost and great value for wide range application.

整个系统安全性高，独立性强，开发成本较低，具有较高的推广价值。

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The union also successfully disputed Mr Scargill's fuel allowance at his Barnsley home and payment for the preparation of his annual tax return but not the cost of his security system in Yorkshire.

BBC: Arthur Scargill

Mr Clinton added three more criteria: an assessment of the threat America faces, the cost of the proposed system, and its implications for national security, meaning the impact it would have on relations with Russia and with America's allies.

ECONOMIST: Anti-missile defence

Add in the big contributions that employers must make to China's national security fund system and the total cost of an employee can be double his basic pay.

ECONOMIST: Human resources