snake oil
noun
mass noun
- informal, chiefly N. Amer. a substance with no real medicinal value sold as a remedy for all diseases〈非正式, 主北美〉（无药效但以医百病为卖点的）蛇油, 万灵药：
some kelp products are snake oil, but the good ones promote plant growth
有些海藻产品是并无药效的万灵药, 但有些品质好的确能促进植物生长
figurative 〈喻〉the president's foreign policy is snake oil.
总统的外交政策是空话、废话。