这是你自定义的文章摘要内容，如果这个属性有值，文章卡片摘要就显示这段文字，否则程序会自动截取文章的部分内容作为摘要

This is the content of your custom post summary. If there is a value for this attribute, the post card summary will display the text, otherwise the program will automatically intercept part of the post content as a summary.