Cliff Park is composed mainly of the Lishunong Ocean Trench, which is formed due to marine-abrasion.

峭壁公园以里柱弄海沟为主体，因海蚀作用而形成。

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Surprisingly, precious metals instead appear relatively abundant on the planet's surface and in the underlying mantle layer. [Infographic: Tallest Mountain to Deepest Ocean Trench].

令人惊讶的是，在地球表面和下面的地幔层里贵金属反而比较丰富。

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This new species of snailfish was discovered 7 kilometres down in the Peru-Chile trench in the south-east Pacific Ocean using a deep-sea baited camera system.

在东南太平洋秘鲁-智利海沟下面的7公里处，使用了深海诱饵式的摄像系统，才发现了这种新品种的狮子鱼。

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The trench is an extremely deep hole on the floor of the Indian Ocean.

VOA: special.2009.03.17

On Jan.23,1960, the two men took the Trieste to the deepest point in the Pacific Ocean's Mariana Trench, a ravine called Challenger Deep.

VOA: standard.2010.06.21

These are factors that impact the nature of the world from the highest mountain peak to the deepest ocean trench.

CNN: An SOS on World Oceans Day: Save our seas, save ourselves

The key was not to try to dig a Suez-type of canal, a great sea-level trench from ocean to ocean, but to create a lock-and-lake canal, where the ships are lifted up by a series of locks to a man-made lake, and then they sail across that lake, and then they are set back down on the other side by another series of locks.

FORBES: Fact and Comment

The billionaires are bankrolling expeditions to reach the deepest place in the ocean, a spot called the Challenger Deep that lies at the bottom of the Mariana Trench, seven miles below the surface of the South Pacific.

FORBES: Branson And Schmidt Race To The Bottom Of The Ocean