求翻译：二、具体分析我国传统白描人物画的历史发展过程及其在学科中的地位，从而明确在中学美术课堂开设白描人物画课程的作用及意义。是什么意思？

Second, a detailed analysis of China's traditional line drawing portraits of historical development and its position in the disciplines, thus opening a clear line drawing in high school art class figure painting course and significance of the role.

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Second, analyzes our country tradition outline drawing portrait specifically the historical development process and in the discipline status, thus is clear about in the middle school fine arts classroom start outline drawing portrait curriculum function and the significance.

Second, the specific analysis of the historical process of Chinese traditional drawing figure painting and its position in the subject, and clearly defined the role of Arts in middle school classroom courses on line drawing in figure painting and its significance.

Second, the specific analysis of the historical process of Chinese traditional drawing figure painting and its position in the subject, and clearly defined the role of Arts in middle school classroom courses on line drawing in figure painting and its significance.