富有成效的问题

further questions───进一步的疑问；其他问题；进一步的问题

political questions───政治问题

critical question───关键性问题；批判性问题

field questions───现场问题；领域问题

four questions───四个问题

previous questions───（国会议事程序中作为动议提出的）先决问题

raise questions───提问

Although the theory of well bounded operators is well established, there are a number of unresolved and interesting questions which are potentially fruitful areas for further research.───尽管良性有界算子理论已经建立，但仍有许多未解决的有意义的问题。

What is clear, however, is that academics need the freedom to discuss and publish their ideas and adequate funding to carry out research in order to pursue these questions in fruitful ways.───但有一点是清晰的，学术界需要讨论和将观点公之于众的自由，还需要让研究产生丰硕成果的充足资金。

this thesis makes an in-depth study on certain key questions in the development of the Saoye Printing House and some fruitful findings have been achieved.───本文则从个个案研究的角度出发，对于扫叶山房发展史上的一些关键性问题进行了较为深入的研究，并取得了一些阶段性的成果。