Doubts persist on the natural history of the virus and further studies are needed to identify the exact reservoir of the monkeypox virus and how it is maintained in nature.
对该病毒的自然史仍存有疑问，需要进一步继续研究，以确定猴痘病毒的确切贮主，以及该病毒在自然界是如何生存下来的。
The exact association between smoking and back pain will have to be clarified in appropriate studies.
吸烟与腰背痛之间确切的关系应该由恰当的研究以澄清。
Many studies have shown that the incidence of the disease is a complex mechanism, multiple factors involved in the pathophysiological process, but the exact pathogenesis is not clear.
许多研究表明，该病的发病机制是一个复杂、多因素参与的病理生理过程，但确切的发病机制并不明了。
However, the exact neural mechanisms of sports decision making processing and its plasticity accompanying training are still unclear because of the limitations in previous studies.
由于前人研究中存在着一些局限性，目前并不清楚哪些确切的脑区会参与运动决策的信息加工和处理过程。
The studies on symmetries and exact invariants (conserved quantities) play a very important role in mechanics and physics.
力学系统的对称性与精确不变量（守恒量）在力学、物理学中具有非常重要的意义。
Yet I should fail in any attempt to convey an idea of the exact character of the studies, or of the occupations in which he involved me, or led me the way.
然而，我却无法明确说出他要我（或者引领我） 去学习什麽或者做什麽事情。
Yet I should fail in any attempt to convey an idea of the exact character of the studies, or of the occupations in which he involved me, or led me the way.
然而，我却无法明确说出他要我（或者引领我） 去学习什麽或者做什麽事情。
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