It's used in introductory classes all over the world.
它在世界各地使用的入门课程。
Electronic course content in standard introductory classes had become a low-cost commodity.
标准入门课程的电子课程内容已成了低成本商品。
From the basic introductory classes to the upper level courses, each professor pushed for higher-quality writing, more attention to accuracy and detail, and a healthy respect for the grammar police.
从基本的概论课到高级课程,每个教授都督促我们写出较高质量的作品、注意文章的准确和细节描写以及语法的规范等。
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