在1971年,史蒂芬·霍金指出任何经典黑洞集合活动视界总面积无法减少。
In 1971, Stephen Hawking showed that the total area of the event horizons of any collection of classical black holes can never decrease.
一个过程是推进它的状态的活动的集合。
BPEL业务流程被定义为可以调用服务的活动集合。
BPEL business processes are defined as collections of activities that invoke services.
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