...培养产出能力的活动（说、写的活动）。如按课堂教学的一般程序来划分，则可分为三大类：1.呈现活动（ presentation activities）；2.练习活动（ drill andpractice）；3.
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Presentation layer: Introducing a portal provides a unified user experience across a range of business activities.
表示层：引入了门户，为用户提供跨业务活动范围的统一用户体验。
There is less consensus on activities that seek in some way to interrupt a presentation or that involve shouting at a speaker.
但是少有人认同在活动中用一些方式阻止演讲者的陈述或者朝演讲者叫喊。
The OV-5 is a graphical presentation of the externally visible behavior of the operational enterprise, represented by flows of activities allocated to component systems.
OV - 5是运作企业的外部可视行为的图形表示，由分配到组件系统的活动流表示。
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