Here in Part 1, the authors posit a set of extensions to DITA XML that provide the starting point for a unifying content model for learning.是什么意思_Here in Part 1, the authors posit a set of extensions to DITA XML that provide the starting point for a unifying content model for learning.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句