“难教的”可以用英语表达为 "difficult to teach" 或 "challenging to teach"。
"difficult to teach"：直接表明教学过程中的难度，适用于描述学生、课程或内容本身难以教授的情况。
"challenging to teach"：更强调教学过程中的挑战性，适用于需要特殊技巧或耐心的场景。
例句：This topic is difficult to teach because it requires advanced mathematical knowledge. （这个主题很难教，因为它需要高级的数学知识。）
Teaching students with learning disabilities can be challenging to teach, but it's also rewarding. （教有学习障碍的学生可能很有挑战性，但也很有成就感。）