求翻译：　　不过,两国就业难产生的原因却有很大不同。中国大学生就业难主要是因为与大学生就业相关的社会政策不完善；高等教育模式不能够适应产业结构的变化；缺一个强大而有效的就业社会支持系统等。而日本的大学生就业难主要是因为其经济形势恶化造成,经济在低谷徘徊,削减了企业的用人需求。是什么意思？

However, the causes of the two difficult employment is quite different. Students Employment and Graduate Employment-related social policy is imperfect; model of higher education are not able to adapt to changes in industrial structure; lack of a strong and effective employment and social support sys