1. 'hadal'是英语词汇，用中文翻译为“海底”的意思。它常常被用来描述深海的极端环境和生物。
2. 使用方法：hadal通常作为形容词，用来描述海洋深处的特定环境和生物，如“hadal zone”（海洋深层区域）、“hadal trench”（海沟），“hadal fauna”（深海生物）等等。
3. 9个例句：
- The hadal zone is the deepest part of the ocean, extending from 6,000 to 36,000 feet below sea level.（“hadal zone”是海洋最深的地方，海平面以下6,000到36,000英尺。）
- The Mariana Trench is the world's most famous hadal trench, reaching a depth of nearly 36,070 feet.（马里亚纳海沟是世界上最著名的hadal海沟，深度近36,070英尺。）
- The hadal fauna includes a variety of unique and bizarre creatures that have adapted to survive in the extreme pressure and darkness of the deep sea.（hadal区域的生物包括多种适应极端压力和黑暗的独特和奇异的生物。）
- Many hadal species have evolved specialized features such as bioluminescence and large jaws to catch prey in the darkness of the deep sea.（许多hadal物种进化出了专门的特征，如发光和大嘴以在深海的黑暗中捕捉猎物。）
- Scientists are still exploring the mysteries and challenges of the hadal zone, using advanced technology to study its unique geology, biology, and chemistry.（科学家们仍在探索hadal区域的神秘和挑战，利用先进技术研究其独特的地质学、生物学和化学。）
- The hadal amphipod is a type of small crustacean that is found only in the deepest parts of the ocean.（hadal天蚕虫是一种小型甲壳动物，只在海洋最深处发现。）
- The hadal snailfish is one of the deepest-living fish species, found in the trenches of the Pacific Ocean.（hadal鳕鱼是最深生活的鱼类之一，分布于太平洋海沟。）
- The extreme conditions of the hadal zone pose significant challenges for underwater exploration and equipment development.（hadal区域的极端条件对水下探测和设备开发提出了重大挑战。）
- The hadal benthos is the community of organisms that live on or in the sediment at the bottom of the ocean trenches.（hadal底栖生物是生活在或在海洋海沟底部的沉积物上的生物群落。）
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