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汉语拼音：hǎi gōu

深度超过6,000米的狭长的海底凹地。两侧坡度陡急，分布于大洋边缘。如太平洋的菲律宾海沟、大西洋的波多黎各海沟等。

1. 清 刘献廷 《广阳杂记》卷二：“ 张岫民 出其近作一卷，中有《与泛日本者谈海沟之异序》，曰：‘去西岸东行，帆过海沟，程居其半。其水黝黑，约三百里，奔流剽急，自北而南，海为之陷，有若沟然，故因其状以名之。’”现用以称深度超过六千米的海底狭长凹地。如 太平洋 西部 马里亚纳海沟 、 菲律宾海沟 等。

• While there is some "coupling" at the Manila Trench, there is debate about just how much.

  当一些“联合”存在在马尼拉海沟，有关于程度的大小还有争论。

• Cameron will dive to the same place Piccard and Walsh did, known as Challenger Deep, located at the southern end of the Mariana Trench.

  卡梅隆将潜到皮卡德和沃尔什曾经到过的同一个地方，也就是众所周知的挑战深度，即马里来那海沟以南。

• It is a trench if it has steep sides and a through if it has gently sloping sides.

  如果它有陡峭的侧边则为海沟，如果它有缓斜坡的侧边则为斜坡。

• "Each dive will be the world's first solo dive to the bottom of the five deepest trenches in the world" he wrote on his blog today.

  我的每次下潜都将是有史以来的第一次，我将独自到达全球最深的五处海沟底部。

• Even the deepest part of the ocean, the Mariana Trench, which plunges 11 km below the surface of the Pacific Ocean near Guam, is inhabited.

  甚至海洋的最深处，太平洋关岛海面下11公里处的玛丽亚娜海沟，也存在着生命。

• The deepest dwelling vertebrates on Earth, snailfish have been discovered in ocean trenches in other parts of the Pacific.

  狮子鱼是一种居住在地球最深处的脊椎动物，太平洋其他地方的海沟也发现过它的身影。

• We need to see deep trenches, the undersea mountains, and understand life in the deep sea.

  我们需要去看看深海海沟，海底山脉了解深海里的生命

• The plates are bounded by an interconnected network of ridges, transform faults, and trenches.

  板块以一个由洋中脊、转换断层和海沟相互连接形成的网络为界。

• The race is on for the next human return to the deepest point in the ocean: the subduction zone of the Pacific's Mariana Trench.

  有个比赛正在为选出下一个即将回到大海最深处的人上演：太平洋的马里亚纳海沟的潜没区域。