4. An intrinsically valuable activity is an ongoing activity that does not seek to achieve an external goal: it is a never-ending process.
一个具有内部价值的活动是一个持续进行，但是不为获得一外在目标的活动。
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5. The filled circle represents the starting point of the activity diagram, effectively a placeholder, and the filled circle with a border represents the ending point.
实心圆表示活动图的起点，实际上是一个占位符，带边框的实心圆表示终点。
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6. Vastus lateralis and vastus medialis muscle EMG activity that two relatively large range, almost the same time the beginning and ending, showing a high degree of consistency.
股外侧肌和股内侧肌这两块肌肉的肌电活动幅度比较大，几乎是同时开始，同时结束，表现出了高度的一致性。
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7. Economists would put it that both the beginning and the ending of an economic activity is culture.
经济学家们说经济活动的起点和终点都是文化。
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8. All those choices add to the idea that our days are never-ending cycles of activity.
这些“选择”只说明了一点：我们的每一天成为了永无休止的活动循环。
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9. All those choices add to the idea that our days are never-ending cycles of activity.
