学生经常被要求展示某个主题，但主要的障碍是他们没有被给予如何正确做的知识。
Very often students are asked to present a certain subject, but the main stumbling block is that they are not given the knowledge of how to do it properly.
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block英 /blɒk/|美 /blɑk/
解释
block 是名词，意思是"障碍物、阻碍"。在这个语境中，stumbling block 是一个固定搭配，字面意思是"绊脚石"，比喻为"障碍、困难"。
Very often students are asked to present a certain subject, but the main stumbling block is that they are not given the knowledge of how to do it properly.
block 是名词，意思是"障碍物、阻碍"。在这个语境中，stumbling block 是一个固定搭配，字面意思是"绊脚石"，比喻为"障碍、困难"。
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