电话网络也许是由互连系统组成的系统的一个最大的示例，并且它的连续工作也证明了这种系统的有效性。
The telephone network is perhaps the largest example of a system made up of interconnected systems, and its continual operation is a testament to the effectiveness of such systems.
这些试验既证明了无数治疗的有效性，也证明了无数治疗的危险。
Such trials have proved the effectiveness of countless treatments, and the dangers of countless others.
该框架提供的API看似非常繁琐，但是框架的受限目标环境充分证明了这些API的有效性。
The API provided by the framework looks quite cumbersome, but it is possibly justified by the constraints of the framework's target environment.
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