These strata are the product of those billions and billions of shells.

这些岩层是数以亿计的贝壳的产物

Contained within the rock strata is evidence that the region was intensely dry 15,000 years ago.

岩层中的证据表明该地区在15,000 年前曾经非常干旱。

There are strata within the Bible that are clearly polemicizing against a certain kind of mythological presentation of the deity.

圣经中有些阶层显然与某种神话形式的神存在矛盾。

The older strata gradually disintegrated.

年代较久的地层逐渐崩解了。

Allocation of samples in the strata.

样本量在层中的分配。

This is a problem that cuts across all strata of society.

这是一个影响到一切社会阶层的问题。