chasm，abyss，abysm，gulf，pit；

[例句] 孩子生病时我陷入了绝望的深渊之中。 I was in the depths of despair when the baby was sick.

[例句] 德国人担心他们的经济会滑入深渊。 Germans worry that their economy is going down the plughole.

origin，source ；

[例句] 他说他的种族渊源对他向来都不重要。 He said his ethnicity had not been important to him.

[例句] 由于年代久远,其渊源已无法考证. It has an origin lost in the mists of antiquity.

profound，deep，erudite ；

[例句] 他在这方面的知识非常渊深. His knowledge about the subject is very profound.

[例句] 我们从未踏进这个广袤渊深的宇宙. We had never stepped into such a cavernous space.

broad and profound，erudite，profound ；

[例句] 这位作家渊博的学问来自长年累月的钻研. The profound erudition of the writer came from long years of study.

[例句] 他是一位学识渊博的人. He is a very learned man.

foredeep ；

foredeep ；

backdeep，after deep ；

intradeep，interdeep ；

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