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。

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.

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这意味着钻石能切割其他任何表面，而且只有用钻石才能对其他钻石进行微小的切割。

That means a diamond can cut any other surface. And only another diamond can make a slight cut in a diamond.

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每个构筑物都采用了不同的折叠形式，目的是“唤起飞行”，并用与当地环境和野生动物相关的信息切割钢材表面。

Each of the structures is made in a different folded form, intended to be "evocative of flight", and has information related to the local environment and wildlife cut into the steel surfaces.

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