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。

youdao

His clothes are begrimed with oil and dirt.

他的衣服被油污弄脏了。

youdao

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。

youdao

After three years of research and testing, they invented several new molecules to fight common hair problems, including OFPMA, which shields hair from oil and dirt.

WSJ: How I Built It: Lawyer Takes On Beauty Care

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.

ENGADGET: Inhabitat's Week in Green: Biobot, Nintendo Power Glove and an inflatable bathroom bubble

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

CNN: STORY HIGHLIGHTS