Never use butter or other fatty or oily substance on a burn.

不要将黄油或其他含脂肪和油脂的东西涂于患处。

Sebaceous glands produce an oily substance known as sebum, which helps make your skin waterproof and prevents it from drying out.

皮脂腺产生油性物质称为皮脂，这有助于你的皮肤防水和防止干燥。

However, by using an oily liquid and an aqueous one, and by covering one side of the channel with a substance that repels water and the other side with one that attracts water, this can be avoided.

但是，利用一种油性液体和水，以及在通道的一面覆盖上一层疏水物质，另一面覆盖上吸水物质，既可避免这一情况。

Petroleum is the biggest pollution substance in the sea environment, and ship oil pollution holds the most proportion of the oily pollution in the sea.

石油是海洋环境中最大的污染物质，而在海洋油类污染中，船舶油污所占的比例最大。

In the whole production process of oil exploration exploitation, there is a type of severe contamination environmental substance to coupled with petroleum together withdrawn oily sludge.

在整个石油勘探开发过程中，伴随着石油一同采出的含油污泥是一种严重污染环境的物质。