A human kidney is worth a premium in the black market. That's why there are criminals who engage in stealing people's kidneys.
black market< >
老師 (讓小朋友出校車後): 別嬉戲，別跟陌生人說話。 (請填空)
Teacher (after letting kids out of the school bus on a field trip): No horsepy. Don't talk to strangers.下一題 - 交通耽擱 f我要發問