In the first half of the 20th century, this theory had come into being and guided the teaching material practice.

20世纪上半叶，教材理论在国外已形成热潮，并发挥了指导教材实践的作用。

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Make it a practice to preview attentively the titles, captions, headings, and other material connected with graphics.

要养成专心预览题目、说明文字、标题和其他与图形相关的材料的习惯。

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The psychologist Dale Kunkel showed that the practice of host selling reduced children's ability to distinguish between advertising and program material.

心理学家戴尔·昆克尔指出，对销售主持人的应用减弱了儿童辨别广告和节目内容的能力。

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Scientists say the practice of feeding biological material from cows to cows can spread the disease.

CNN: Democrats criticize administration over mad cow

It is YouTube's standard practice to remove any material that they receive even the flimsiest threat for because the company wishes to avoid all litigation.

CENTERFORSECURITYPOLICY: YouTube silences Latma, removes We Con the World

One reason is that companies, in spite of urgings from various bodies set up to examine best corporate practice, rarely give them the raw material or opportunity to do so.

ECONOMIST: Keep on purring