单词：ocean trench
ocean trench的用法和样例：
例句
- The greatest depths of the ocean are found in the ocean trenches.海洋的最深深度是在这片海沟中测出的。
- 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。
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