These two conditions are realized by human practical activity.

而这两个条件又是通过人的实践活动实现的。

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Last week, my teacher told us that we would have a practical activity.

上周，老师告诉我们，我们将会有一个实践活动。

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Library literature management is a kind of particular practical activity.

有免费使用图书馆科学文献的机会。

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He wants to establish whether it was part of a practical activity taught to and studied by sailors looking to navigate by the stars.

BBC: NEWS | UK | Wales | Scholar revives ancient subject

The chief executive of the Association for Science Education, Annette Smith, said it did not assess science as it happened in primary schools - as an active, practical activity which built on children's curiosity and observation skills.

BBC: All school Sats tests 'might go'

Their favourite activity is to ask each other questions about practical research problems, from DNA-sequencing techniques to statistical tricks.

ECONOMIST: More connective tissue may make academia more efficient