A training sample needs to be pure text, extracted from a sample document of the category in question.

训练样本应该是纯文本，是从涉及的目录的样本文档中提取出来的。

youdao

The theoretical understanding on values of instruction is the necessary preparation for defining the detailed question category, emphasis point and analysis framework.

探讨教学价值观念问题离不开对教学价值观念的理论认识，这是确定具体的问题域、着力点与分析框架的必要准备。

youdao

When you want to know what something, like a bachelor, is, you want to know (1) the feature or features of the kind in question that every proper member of the category possesses;

在你想知道某事物（如一个单身汉）是什么的时候，你是想知道（1）那个范畴的每一恰当成员所属的那个类所拥有的特点；

youdao

As the ventures grow, they are also confronting the question of whether coding a broad category of computer-science skills ranging from building websites to data analysis can really go mainstream.

WSJ: Beyond the Three R's: Push to Teach Coding at School

The answer to that question will change, of course, dependant upon the category in which you compete.

FORBES: You're On Facebook. OK, Now What?

Just as consumers have legitimate reasons for buying multiple brands in the same category, when we are beginning our careers (or have other reasons why being number one is out of the question), we can brand ourselves in a way that our offer is unique enough to keep us in demand despite a general preference for something else.

FORBES: The Wallet Allocation Rule and Your Brand