| 词汇 | stratum |
| 词根词缀 | 词源： "horizontal layer," 1599, from Mod.L., special use of L. stratum "thing spread out, coverlet, pavement," from neut. pp. of sternere "to spread out, lay down, stretch out," from PIE *stre-to- "to stretch, extend," from base *stere- "to spread, extend, stretch out" (see structure). |
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