教科书的空无内容是教科书中应该呈现却没有呈现的内容。
The null content of a textbook means such a kind of content that should be contained in the textbook but not.
空无课程是指学校中应该有而没有的课程，教科书的空无内容是指教科书中应该呈现而没有呈现的知识。
The null content of a textbook means such a kind of content that should be contained in the textbook but not.
文章首先对《二祖调心图》中的图像内容进行了深入解读，并从老庄哲学的空无思想来解释石恪特殊画风的成因。
First of all, author analyses the contents of portrait and applies the idea of LaoZi and ZhuangZi to explaining the special painting style of ShiKe.
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