The depth of his knowledge on the subject is impressive.

他在这个主题上的知识深度令人印象深刻。

The breadth of his knowledge on the subject is impressive.

他在这个主题上的知识宽度令人印象深刻。

The book provided a great deal of enlightenment on the subject.

这本书在这个主题上提供了大量的启迪。

She was surprised by the extent of his knowledge on the subject.

她对他在这个主题上的知识程度感到惊讶。

Shall I quote other thinkers on the subject?

我可以在此主题上引用其他思想家的话么？

Her views on the subject are rather dated.

她对这个问题的看法相当过时。

Culbertson wrote several books on the subject.

库尔伯特森写了几本关于这个主题的书。

The article quotes several experts on the subject.

这篇文章引用了几位专家的意见。

She felt unqualified to give advice on the subject.

她觉得自己在这个话题上给建议是不合格的。

The article is quoting several experts on the subject.

这篇文章引用了几位专家的观点。