Surfaces to be welded or thermally cut shall be cleaned of all foreign material such as grease, oil, dirt, scale, slag and paint that would be detrimental to either the weld or base material.

需焊接或热切割的表面应排除所有可能会损坏焊材或母材的杂物，如脂、油、灰尘、水垢、熔渣和油漆等。

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His clothes are begrimed with oil and dirt.

他的衣服被油污弄脏了。

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Encapsulated surface mount electronics provide resistance to water, oil, dirt, high temperatures, shock and vibrations and overall harsh environments.

表面贴装电子封装提供抗水，油，灰尘，高温，冲击，振动和整体恶劣环境。

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Bitumen, otherwise known as tar sand, is oil-soaked dirt that needs to be cooked to extract the oil.

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The crude is squeezed out of huge chunks of strip-mined dirt, as opposed to drilled from pools of oil underground.

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For starters, check out UltraTech's Ever Dry -- a miraculous nanocoating that can make practically any object impervious to water, oil, dirt and even wet concrete.

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