So this is further subject of study in fact.
因此这个问题需要进一步的研究探讨。
This paper takes Feicheng mine area as the subject of study.
本研究以肥城矿区为研究对象。
The rise of the modern State of Israel is also a subject of study.
现代以色列的崛起也是研究的一个主题。
Any subject of study needs justification: its advocates must explain why it is worth attention.
任何学习的科目都需要解释：它的倡导者必须得解释为什么是值得关注的。
Any subject of study needs justification: its advocates must explain why it is worth attention.
任何学习的科目都需要解释：它的倡导者必须得解释为什么是值得关注的。
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