n.黑社会，黑道，犯罪集团，阴间，冥府，阴曹地府

The underworld boss gave a directive to his minions.
地下世界的头目给他的手下下达了指令。
She infiltrated the criminal underworld to gather evidence for her exposé."
她潜入了犯罪黑帮以收集揭露他们的证据。
His involvement in the drug trade led him deep into the underworld.
他涉足毒品交易使他深陷地下世界。
In the underworld, loyalty is valued more than anything else.
在地下世界里，忠诚比任何事物都更为看重。
Detectives were working tirelessly to dismantle the complex network of the city's underworld.
侦探们正在不懈努力地拆解这座城市地下世界的复杂网络。
He had to navigate the treacherous waters of the gambling underworld to repay his debts.
为了偿还债务，他不得不在赌博黑市的险恶环境中周旋。
The notorious gangster was known as the kingpin of the local underworld.
那位臭名昭著的黑帮老大被认为是当地地下世界的老大。
Her informants within the criminal underworld provided valuable intelligence to law enforcement.
她在犯罪黑帮内部的情报员为执法部门提供了宝贵的线索。
After years on the run, the former mob boss finally faced justice in the courtroom above the underworld.
逃亡多年后，这位前黑手党头目终于在高悬于地下世界之上的法庭上接受了正义的审判。
The detective's undercover operation brought to light many secrets hidden within the seedy underbelly of society.
警探的秘密卧底行动揭示了许多隐藏在社会阴暗角落的秘密。