nothing is more important to A than B的意思~
问题描述：
nothing is more important to A than B的意思~
原句：Nothing is more important to the theory of words and rules than an explanation of how children acquire rules and apply them.
答
这里的to ...是 对于...来说 的意思,这个句子相当于To the theory of words and rules,nothing is more important than an explanation of how children acquire rules and apply them.
翻译：对于词汇与规则的学习理论来说,没有什么会比如何让孩子学得与应用他们的详细说明更重要（或者：如何让孩子学得并应用词汇与规则才是最重要的）.