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demersal
[demersal 词源字典]
"(Chiefly of fish) living close to the floor of the sea or a lake", Late 19th century: from Latin
demersus
(past participle of
demergere
'submerge, sink', from
de-
'down' +
mergere
'plunge') + -al.
[demersal etymology, demersal origin, 英语词源]