Negation, namely the two-way negation relationship between human as subject and humans outer world as object, is the essence of human activity of practice.

否定性是人的实践活动的本质，即人作为主体与外部世界作为客体之间的双向否定性关系。

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With practice of an activity or skill, your synaptic density increases, and what was once novel and complex can easily become rote and passive.

随着对一项活动或技能的练习，你的突触密度增大，曾经是新奇而复杂的东西可以很容易变得机械而死板。

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Everyday Practice of Science by Frederick Grinnell argues the well-worn and obvious point that science is a human activity.

弗雷德里克·格林内尔的《日常科学实践》重复了一个老生常谈并显而易见的观点，即科学是一种人类活动。

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Rivera will continue shagging fly balls in batting practice, an activity that has the approval of Yankees manager Joe Girardi.

WSJ: Rivera plans to announce if this is final season

If "placentophagia" - the practice of eating the placenta - remains a minority activity, there have been other applications.

BBC: NEWS | UK | Magazine | Why eat a placenta?

It aims to do this through facilitating discussions between learned societies and other stakeholders on relevant initiatives, sharing good practice, and examining the scale and status of current activity.

UNESCO: UK National Commission for UNESCO :: Learned Societies