I begin with the nearly trivial observation that members of a familiar perceptual category automatically evoke the name of the category.

我先从近于琐碎的事物开始观察，发现对于日常熟知的事物，我们看到其个体就能自然联想到其所属类别的名字。

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The observation of increasing symptom severity from one category to the next reinforces "the validity of the spectrum concept of bipolarity, " the researchers note.

研究者把一个分类到另一分类的严重症状进行了补充，从而形成一个有效的双重精神障碍的疾病谱系，研究者并对此进行了特别说明。

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It is for us, at the Chinese Academy of Sciences and in particular the Centre for Earth Observation and Digital Earth, a great honour to host this International Centre, a Category-2 Centre, under the auspices of UNESCO, said Prof.

UNESCO: NATURAL SCIENCES