求翻译：数学“情境—问题”教学对数学教师的专业知识提出了哪些方面的要求，成为理论研究和教学实践中必须思考的问题．依据数学教学内容知识（MPCK）理论，分别从MK、PK、CK三类知识的各个维度分析“情境—问题”教学中教师需要的专业知识，进而得出：数学教师运用所需的MPCK思考“情境—问题”教学的最佳设计思路，寻求解决学生学习疑难点的最优方法，做出最有效的教学决策，是“情境—问题”教学有效实施的关键；理解并掌握相关MPCK，可以促进“情境—问题”教学实践中教师的专业发展．是什么意思？

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Math "situational-problem" of the teaching of mathematics teachers in the expertise of a theory, and research and teaching in the practice of thinking must be based on teaching math problems, content knowledge (MPCK) theory, respectively, from MK PK CK , 3 types of knowledge of various dimensional a

Mathematical "situation-problems" teaching on mathematics which demands on teachers ' expertise, theoretical research and teaching practice in question must be. Pursuant to mathematics teaching content knowledge (MPCK) theory, respectively from MK, and PK, and CK three class knowledge of all dimensi