| 释义 |
understratum
un·der·stra·tum U0060000 (ŭn′dər-strā′təm, -străt′əm)n. pl. un·der·stra·ta (-strā′tə, -străt′ə) or un·der·stra·tums A substratum.understratum (ˈʌndəˌstrɑːtəm) n, pl -ta (-tə) or -tums (Physical Geography) the layer of soil underneath the soil on the surface; a substratum or subsoilunderstratum
understratum (ŭn′dər-strā′təm, -străt′əm)n. pl. under·strata (-strā′tə, -străt′ə) or under·stratums A substratum. |