rock cover

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.

A sharp overhang of rock gave them cover.

一块凸出来的尖利岩石成了他们的避身之所。

Next, cover the hole with the plastic sheet, securing the edges of the plastic with dirt and weighting the sheet's center down with a rock ．

接下来,用塑料板盖住孔,用泥土固定塑料边缘,并用石头将塑料板的中心向下压。

The preliminary thickness of the subsea tunnel rock cover was determined through using project analogy method.

根据国内外已建成的海底隧道资料,采用工程类比方法初步确定象山港海底隧道的最小岩石覆盖厚度.

The main cover is the broadleaf forest on red soil of basaltic rock and limestone type, the mixed forest on red soil of metamorphic rock, silt sandstone and Q2 type, and the conifer forest onred soil of granite type in South china.

华南玄武岩型、灰岩型红土上覆植被以阔叶林为主，变质岩、粉砂岩、北海组（q2）型红土为针阔叶混交林，花岗岩型红土则以针叶林为主。

A sharp overhang of rock gave them cover...

一块凸出来的尖利岩石成了他们的避身之所。

A sharp overhang of rock gave them cover

一块凸出来的尖利岩石成了他们的避身之所。

The results of Canonical Correspondence Analysis indicated that the correlations order of the community distribution with the environmental factors were bareness degree of rock, slope gradient, altitude, canopy cover and slope aspect in large to small.

CCA分析表明：环境因子与群落分布的相关性由大至小依次为岩石裸露度、坡度、海拔、郁闭度、坡向。

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

合理确定隧道顶板厚度是地下工程中一个亟待研究解决的课题.