他们过滤掉地沟油里的食物残渣，然后将油重新卖给希望削减成本的餐馆和商贩。
They sift old pieces of food from the oil and then resell it to restaurants and vendors looking to cut costs.
在重复使用液态煎炸油之前，应过滤除去食物残渣。
Before you reuse liquid deep fryer grease, it should be strained to remove old crumbs and food particles.
为了更快地过滤油脂，是不是用勺子搅一下防止食物残渣堵住了滤网。
To strain the oil at a faster rate, occasionally stir it with a spoon to help prevent crumbs and particles from blocking the holes in the filter basket or colander.
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