It helps you understand how the system or service would work.

它帮助您理解系统或服务是如何运作的。

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Once the system or service has been made unavailable, legitimate clients are blocked from using the network service hosted by the system under attack (See Figure 2).

如果系统或服务不可用，合法用户就无法使用受攻击系统上的网络服务(见图2)。

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Software testing is a technical investigation conducted to provide stakeholders with empirical information about the quality of a software product, system or service.

软件测试是一门对软件进行检视的技术，用来根据测试实验向相关人员提供关于软件产品，系统或服务的消息。

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Two to four years of relevant professional experience, including at least one year in the United Nations system or in a diplomatic service.

UNESCO: Main Menu

Your positive or negative belief system regarding making money selling your product or service often determines the success or failure of your business.

FORBES: Do You Have A Fear Of Selling?

Imagine a payment system that offered a subscription service or brewing equipment rentals.

FORBES: Starbucks Is Reinventing the Role of Payments. Will Payments Leaders Take Notice?