abysm

n.a bottomless gulf or pit; any unfathomable (or apparently unfathomable) cavity or chasm or void extending below (often used figuratively)

同义词：abyss

1. He felt as if he were staring into an abysm of despair.
   他感觉自己仿佛在凝视一片绝望的深渊。
2. The abysm of the ocean is home to many unknown creatures.
   海洋的深渊是许多未知生物的栖息地。