abyssn.深渊;无底洞
abyssal hill深海丘陵
abyssal cave海底扇
abyssal rock深成岩
abyssal dune深海沙丘
abyssal area深海区
abyssal clay深海粘土
abyssal fish深海鱼类
abyssal cone深海锥
abyssal ooze深海软泥
abyssobenthosn.深海海底生物;底栖生物
"the abyssal depths of the ocean"