"horizontal layer," 1590s, from Modern Latin special use of Latin stratum "thing spread out, coverlet, beadspread, horse-blanket; pavement," noun uses of neuter of stratus "prostrate, prone," past participle of sternere "to spread out, lay down, stretch out," from PIE *stre-to- "to stretch, extend," from root *stere- "to spread, extend, stretch out" (see structure (n.)).
实用例句
1. It was an enormous task that affected every stratum of society.
这是一项影响到社会各阶层的重大工作。
来自柯林斯例句
2. An aquifer is a water - bearing rock stratum such as sandstone and chalk.