How to determine reasonable subsea tunnel rock cover thickness is still an intractable research subject.

合理确定隧道顶板厚度是一项重要的研究课题。

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In underwater tunnel construction, to confirm the reasonable cover thickness is the key in the technology.

合理的确定水下隧道覆盖层厚度是建设水下隧道关键技术之一。

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The result shows that cover thickness is the key factor which determines the durability of industrial concrete mill buildings.

结果表明，混凝土保护层厚度是决定混凝土工业厂房耐久性至关重要的因素。

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The amount of ice cover and its thickness are two measures of the health of the Arctic Sea.

VOA: special.2009.05.05

In a large heart attack, the area of cell death can cover the entire thickness of the chamber's wall.

BBC: Dr Robert Judd

With 102 holes drilled so far, hundreds of measurements have been made of ice thickness and snow cover over the 243km covered to date.

BBC: Arctic team: 'London, we have a problem'

This has allowed scientists to retrieve information about the Arctic Ocean region's gravity field, its surface circulation, and the thickness of its sea-ice cover.

BBC: Cryosat spots Arctic sea-ice loss in autumn