毫无疑问，使用BPEL是以活动为中心的服务的“最容易”实现方法。
No question, using BPEL is the "easiest" implementation approach of activity-centered services.
透过大面积的玻璃能看到里面花园中心老树周围正在举行的活动。 所以甚至从门厅也可以看到最里面的活动。
The large expanses of glass exposes events taking place around the old tree standing in the centre of the garden so that they are visible even from the foyer.
机场是航空运输系统的一个组成部分，是民航一切活动的中心，是民航系统结构最复杂的子系统。
The airport is a part of the whole civil aviation transportation system, it is the operation center of the civil aviation, and the most complicated subsystem of the whole system.
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