- 万丈深渊 wànzhàngshēnyuān bottomless abyss(idiom) an extremely deep place or abyss
- 如临深渊 rúlínshēnyuān on the brink of an abyss(idiom) as if standing on the edge of a deep pit; used to describe being extremely cautious or feeling very anxious when handling a matter
- 如临深渊，如履薄冰 rúlínshēnyuānrúlǚbóbīng to tread on thin ice(idiom) to be extremely cautious and on guard, as if standing at the edge of a deep abyss or walking on thin ice; to proceed with extreme caution and apprehension
- 精深渊博 jīngshēnyuānbó profound and eruditepossessing deep knowledge and broad learning; extensive and profound scholarship
