stratum例句
An aquifer is a water - bearing rock
stratum such as sandstone and chalk.
地下蓄水层是一些有水的岩石层,如沙岩和白垩岩.
The coal is a coal resource that reserves in old
stratum.
石煤是贮藏在古老地层中的一种煤炭资源.
A portion of bedrock or other
stratum protruding through the soil level.
露出地表的一部分基岩或其他地层.