Drawing the definition of the concept of the income and high income and discussing these two questions is order to prevent the concept from being unclear in research.

引出收入的概念和高收入的界定，讨论这两个问题是为了使得研究能够避免概念不清。

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Article 2 These Provisions shall apply to the autopsy of cadavers of patients with infectious diseases or with suspected infectious diseases, with the causes of which being unclear.

第二条本规定适用于病因不明的传染病病人或者疑似传染病病人尸体的解剖查验工作。

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The exact reason for the link is unclear, and being tall has also been associated with a lower risk of other conditions, notably heart disease.

这种联系的具体原因尚不明确，个子高有时候还可能会降低罹患其他一些疾病的几率，心脏病就是个典型的例子。

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The plan was widely criticised for being unclear about the costs of emissions reduction.

ECONOMIST: A country divided about greenery

But no one can accuse Mr Romney any longer of being unclear about what he will do if he makes it to the White House (see article).

ECONOMIST: Paul Ryan

It remains unclear whether Zaluska is being viewed as a replacement or a back-up to fellow Pole Artur Boruc.

BBC: Celtic confirm deal for Zaluska