Practical training is a necessary instruction element, is a key path to produce application-oriented and technology-oriented expertise.
实训是高等职业教育不可缺少的重要教学环节，是应用型和技能型人才培养的重要途径。
A node can be a piece of text (such as an element's content), an element, or a processing instruction or comment.
节点可以是一段文本(比如元素的内容)、一个元素、一条处理指令或者注释。
Therefore, the xsl:fallback element should contain whatever is needed to substitute for the single instruction that contains it.
因此，xsl:fallback 元素应该包含替换包含它的单一指令所需要的全部内容。
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