“使难理解”可以用英语表达为 "make difficult to understand" 或 "render incomprehensible"（程度稍深，表示“使完全无法理解”），也可用 "obscure"（作动词时，意为“使模糊；使难理解” ） 。以下为具体例句：
* make difficult to understand
The technical jargon in this report makes it difficult to understand for non-experts.
（这份报告中的技术术语让非专业人士难以理解。）
* render incomprehensible
The complex mathematical formulas rendered the explanation incomprehensible to most students.
（复杂的数学公式让大多数学生对解释感到无法理解。）
* obscure（动词用法）
His unclear explanation obscured the main point, making it difficult to understand.
（他含糊不清的解释模糊了重点，让人难以理解。）