从经济学的角度来看，为了应对负外部性，原则上应该征收的税收是准确的：对一升燃料征收的税应该等于使用一升燃料所造成的危害。

Economics is precise about the tax that should, in principle, be levied to deal with negative externalities: the tax on a liter of fuel should be equal to the harm caused by using a liter of fuel.

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使用这个接口，外部性的构件就能够请求操作(例如，探索或者交付工作项流程的执行)，或者从数据中心模型那里获取信息。

Using this interface, external components can request operations (for example, the execution of a discovery or provisioning workflow), or retrieve information from the datacenter model.

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在其他场景中，由于IT基础结构的复杂性，可能需要使用外部存储过程。

In other scenarios the use of external stored procedures might be required because of it infrastructure complexity.

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