Activities and their flows are the main abstractions and the data manipulated by the processes is essentially hidden in process variables.

活动和活动流是主要的抽象，由过程维护的数据实际上隐藏在过程变量中。

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He revealed hidden pipes that discharged black effluent from local factories into the river, which flows into Lake Tai.

他揭露出了隐藏的管道，从当地工厂向河水泻出黑色污水并且流向太湖。

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A world hidden inside, where time flows at its own pace, an vacant space leaving an impression just by its spaciousness.

隐藏在世界，在时间的流动按自己的步调，一个空置面积仅留下一个印象的宽敞明亮。

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Our health data is held in hundreds or thousands of places we have never heard of because of hidden data flows.

FORBES: Health Care Reform: Let's Not Forget Privacy And Data Security

From there untold flows move around the world, many hidden by that ultimate British secrecy invention: the trust.

FORBES

The channels remained hidden because the once volcanically active region had been filled in by lava flows hundreds of millions years ago.

NPR: Radar Reveals Apparent Buried Channels On Mars