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subterranean (adj.)
[subterranean 词源字典]
c. 1600, from Latin
subterraneus
"underground," from
sub
"under" (see
sub-
) +
terra
"earth, the ground" (see
terrain
) +
-an
.
[subterranean etymology, subterranean origin, 英语词源]
[subterranean 词源字典]