此文件描述活动 bundle，如清单 7 所示。

This file describes your activity bundle, as shown in Listing 7.

youdao

接下来，需要创建 4 个文件，用来实现和描述活动。

Next, you need to create four files that are used to implement and describe an activity.

youdao

State Machine——描述活动对象的行为。

State Machine ? describes the behavior of the active object.

youdao

I'm thinking particularly of the images describing the activity of reading.

我觉得尤其是描述阅读活动,的形象。

耶鲁公开课 - 弥尔顿课程节选

And it's a sentence you wanna use when you wanna describe an activity that

当你想描述一项活动时，你可以使用这个句型。

I feel like 课堂 - SpeakingMax英语口语达人