结构化活动(Structured activity)：用于管理活动序列的整个流程流、活动的并行处理以及在控制流程流时添加条件逻辑。

Structured activities: for managing the overall process flow for sequencing of activities, parallel processing of activities, and adding conditional logic in controlling the process flow.

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最终的结果是一股持续的气体流，开始是星系间的热气体，结束时是一股被称为“冷却流”的少量冷气体，落入星系中央。

The net result is a continuous flow of gas, starting as hot gases in intergalactic space and ending as a drizzle of cool gas called a "cooling flow," falling into the central galaxy.

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在部署消息流时使用该 BAR 文件。

The BAR file is used when the message flow is deployed.

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As you walk amid the buildings and trees, as you see your friends and classmates, allow these emotions to float through you, freely, lightly.

在你走在建筑物和树木之间时，在你看到朋友和同学时，让那些情绪流遍你的全身，自由地，轻盈地。

哈佛公开课 - 幸福课课程节选