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abyssal + noun
abyssal 常用来修饰地理术语，如 plain（平原）、zone（区域）、hill（丘陵）等。
The abyssal plain is a flat area of the ocean floor.
深海平原是海底平坦的区域。
深海的；深渊的
先理解核心含义，再看它在真实句子里的用法。
深海的；深渊的
Relating to the deepest part of the ocean, especially below about 2,000 metres.
The abyssal plain is a flat area of the ocean floor.
深海平原是海底平坦的区域。
属于或与海洋深处有关,尤其是2000米(6500英尺)以下:深海区
Of or belonging to the ocean depths, especially below 2000 metres (6500 ft): abyssal zone.
与地壳深处有关或发生在地壳深处的；深成的
Pertaining to or occurring at excessive depths in the earth's crust; plutonic.
在绝望的深渊中；阴郁的
In the utter depths of despair; gloomy.
The abyssal plain is home to many strange creatures.
深海平原是许多奇特生物的家园。
Only specialized submersibles can survive the abyssal pressures.
只有专门的潜水器才能承受深海压力。
The abyssal darkness was broken only by the submarine's lights.
深海的黑暗只有潜艇的灯光才能打破。
abyssal 常用来修饰地理术语，如 plain（平原）、zone（区域）、hill（丘陵）等。
The abyssal plain is a flat area of the ocean floor.
深海平原是海底平坦的区域。
作表语时描述性质，通常用于学术或文学语境。
The ocean depths are abyssal and largely unexplored.
海洋深处是深不可测的，且大部分未被探索。
特定组合如 abyssal zone（深海区）、abyssal depth（深渊深度）是固定术语。
Scientists study the abyssal zone to understand deep-sea ecosystems.
科学家研究深海区以了解深海生态系统。
Not this
The abyss zone is dark.
Use this
The abyssal zone is dark.
abyss是名词，意为'深渊'；而abyssal是形容词，意为'深海的'。在名词前应使用形容词形式。
Not this
The abyssal cave was deep.
Use this
The abyssal plain is deep.
abyssal特指海洋深处（2000-5000米），不能用于描述洞穴等地形，应使用deep或bottomless。
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通常用作定语
Dictionary facts from ECDICT, WIKTIONARY.