N-UNCOUNT 蛇油; 狗皮膏药; 号称灵药但并无药效的江湖药Snake oil is used to refer to any substance that is claimed to be a medical remedy but which in fact has no healing properties. 蛇油; 狗皮膏药; 号称灵药但并无药效的江湖药 [disapproval]
Traditional and folk remedies are often labelled as snake oil and witches' potions.