A number of object models were proposed for implementing activity-centered services, the most interesting being the active object model.

人们建议了许多对象模型来实现以活动为中心的服务，其中最有趣的是活动对象模型。

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As a result, a generic object model for activity-centered services has emerged along these lines.

因此，以活动为中心的服务的通用对象模型已通过以下代码行浮现出来。

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The cores of this project are how to develop enterprise components centered on Frame through Object Orient thought and several critical techniques.

设计的重点是如何以构架为中心，以面向对象的思想来设计业务组件以及设计时的一些关键技术。

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To date, balloon-borne activities have centered around heliophysics and astrophysics that have not required precision-pointing, says Near-Earth Object (NEO) program officer Rob Landis at NASA headquarters.

FORBES: Budgets Nudge NASA Toward Balloon-Based Planetary Science: First Target? Comet ISON