Only when a system possesses natural or artificial boundariesthat associate the water within it with the hydrologic cycle may theentire system properly be termed hydrogeologic.

只有当某一地质系统拥有自然的或人工的界限，将该系统内的水与水文循环起来，这整个系统方能被恰当地称为与水文地质学相关。

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The power system often suffers natural and artificial disturbances during operation, so malfunction is inevitab.

电力系统运行中，时常经受各种自然和人为的干扰，故障的发生难以避免。

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Only when a system possesses natural or artificial boundaries that associate the water within it the hydrologic cycle may the entire system properly be termed hydrogeologic.

只有当一个系统拥有自然的或人工形成的边界来把边界中的水与水文循环联系起来的时候，才有可能把整个的系统恰当的成为与水文地质学有关。

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That really would act like an artificial nervous system bypassing the patient's broken natural one.

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It also is the city's largest natural reserve, famous for its ancient system of shallow canals and chinampas, a method of Mesoamerican agriculture that utilises artificial islands for cultivating vegetables, herbs and flowers which is still in use today.

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