泛指在生活中存在的各类劣质油，如回收的食用油、反复使用的炸油等gutter oil

• 因为查处地沟油，他多次受到过威胁。

  He has been threatened on many occasions for investigating gutter oil.

• 地沟油和病死猪肉回流餐桌给我们的健康带来严重的危害。

  Gutter oil and diseased pork meat flowing back to the dinner table pose a serious threat to our health.