understratum
/uhn-der-strey-tuhm, -strat-uhm/US // ˈʌn dərˌstreɪ təm, -ˌstræt əm //
基层,基底层,底层,下层
Definitions
n.名词 noun
- 1
plural un·der·stra·ta [uhn-der-strey-tuh, -strat-uh], /ˈʌn dərˌstreɪ tə, -ˌstræt ə/, un·der·strat·ums.
- : a substratum.
Examples
Where the city is now built it is fine siliceous sand, supported by an understratum of clay, which is of varied colors.
But there is an understratum of deep, calm sea, which the breath of the wildest tempest can never reach.
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