With 100 children of age 2 to 5 sampled at random, two weeks' natural observation is carried out by teachers and parents to assess children's pro-social behaviors along with their daily performance.

随机抽取中班、小班儿童各100名，由教师和家长分别对其进行2周的自然观察，并结合平常表现，对幼儿亲社会行为进行评定。

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Muir's learning in observation throughout his life led him to devote his last years to preserving the natural environment.

缪尔一生都在观察中学习，这使他在生命的最后几年致力于保护自然环境。

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Call-backs and running gags are advanced techniques the humor experts use to get laughs. They're a natural when you sharpen your observation skills.

回味和重复是一些幽默行家用来博得大笑的高级技巧，当你的观察技巧提高的时候那些就是自然而然的事了。

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The theme of the Conference is "New Era of Earth Observation on Natural and Cultural Heritage".

UNESCO: Detailview | United Nations Educational, Scientific and Cultural Organization

The joy of this man, however, lies less in these starry speculations than in the way he loved to apply observation of the natural or mechanical world to deeper and more difficult concepts.

ECONOMIST: English poets

The climate changes and our growing needs in natural resources require the engagement of more scientists in order to contribute in the observation of our planet and thus the understanding of natural phenomena and the dissemination of scientific knowledge to the public.

UNESCO: 70 Years