strata例句
The older
strata gradually disintegrate.
较老的岩层渐渐风化.
Contained within the rock
strata is evidence that the region was intensely dry 15,000 years ago.
岩层中有证据表明，该地区在15,000年前曾经非常干旱。
We can follow the history of life through the
strata.
我们可以通过这一层层的地层跟踪生命的历史.