sea-floor trench

• 海沟

sea-floor trench的用法和样例：

例句

1. Consider the abyssal valley called the Marianas Trench, lying west of Guam.
   留心一下位于关岛西面的名叫马利亚纳海沟的深海谷地。
2. Researchers have discovered a potential new species of comb, or ctenophore, jellyfish near the Ryukyu Trench near Japan.
   在日本附近的琉球海沟，研究者们发现了栉水母的一个可能新种。