Steel surface should be no visible oil, dirt, scale, rust and paint coating attachments, any markings should be only slight discoloration of dot or stripes.

钢材表面应无可见的油脂、污垢、氧化皮、铁锈和油漆涂层附着物，任何残留痕迹应仅具点状或条纹状的轻微色斑。

youdao

Steel surface should be no visible oil, dirt, scale, rust and paint coating and other attached objects, the surface should be showed homogeneous metal color.

钢材表面应无可见的油脂、污垢、氧化皮、铁锈和油漆涂层等附着物，该表面应显示均匀的金属色泽。

youdao

Steel surface should be no visible oil, dirt, scale, rust and paint coating and other debris should as far as possible eliminate, any attachments should be strong.

钢材表面应无可见油脂、污垢、氧化皮、铁锈和油漆涂层及其它杂物应尽可能除去，任何附着物均应是牢靠的。

youdao

To date, approximately 500 live turtles have been rescued during the Gulf oil spill, and more than 450 stranded or captured turtles have had visible evidence of external oil.

CNN: Allen: 'Our first goal is to do no harm' in Gulf

BP's spill is only the latest and most visible evidence of the oil and gas industry's ongoing environmental destruction in the Gulf.

CNN: Gulf reopen for drilling as region suffers

They threw bait into the water the trail of fish oil in their wake was visible more than a mile away and dumped spools of polypropylene cording, which floated near the surface.

NEWYORKER: Neptune��s Navy