Write in the missing words, and then look at the text in Lesson 1.
填入所缺的词，然后查看第1课的课文。
Write in the missing words, and then look at the text in Lesson 31.
填入所缺的单词，然后查看第31课的课文。
Write in the missing words, and then look at the text in Lesson 3.
填入所缺的词，然后查看第3课的课文。
List of symbols and a short text for the table of contents are missing.
缺少对表格中特定符号和表格内容的简短介绍。
List of symbols and a short text for the table of contents are missing.
缺少对表格中特定符号和表格内容的简短介绍。
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