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substratum (n.)
[substratum 词源字典]
1630s, from Modern Latin
substratum
(plural
substrata
), noun use of neuter singular past participle of Latin
substernere
"to spread underneath," from
sub-
(see
sub-
) +
sternere
(see
stratum
).
[substratum etymology, substratum origin, 英语词源]