In the texture category, the researchers tested metaphors such as "having a rough day" and "using coarse language," by giving people a puzzle to solve that was either smooth or covered in sand paper.

在有关质地的调查中，研究人员通过给人们猜一个或是表面光滑，或是用砂纸包裹的谜语，来测试诸如“不舒服的一天”、“讲粗鲁的话”等比喻。

youdao

Electronic paper is surely in the second category.

电子纸肯定就属于第二类。

youdao

This paper is a research about Chinese semantic categories system, in which the mainly discussing subject is instrumental category.

本论文是关于汉语语义范畴系统的一个专题研究，主要讨论了汉语中的工具范畴。

youdao

That was the first entry in the Bathroom category of my research files, which at the time were recorded with pen and paper.

WSJ: Jeffery Deaver on Bathrooms Around the World | Traveler's Tale