The surface layer system of Geography textbooks consists of text system, picture system and practice system. The thesis focuses on the picture system of middle school geography textbooks (PSMSTG).是什么意思_The surface layer system of Geography textbooks consists of text system, picture system and practice system. The thesis focuses on the picture system of middle school geography textbooks (PSMSTG).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句