dross

noun

1. worthless or dangerous material that should be removed

e.g. there were impurities in the water

Synonym: impurity

2. the scum formed by oxidation at the surface of molten metals

Synonym: slagscoria

1. 渣滓;废物
If you describe something as dross, you mean that it is of very poor quality or has no value.

e.g. I go through phases where everything I write is just dross.
有几段时间我写什么都是垃圾。

1. 浮渣：指波焊机槽中熔锡液面上,所施加的特殊油类或类似油类之液体,以防止焊锡受到空气的氧化,以及减少浮渣(Dross)的生成,有助于焊锡性的改善,此等液体也称 Soldering Oil或 Tinning Oil等.

2. 残渣：可见与Sn-Pb钎料相比,高Sn含量的无铅钎料更容易氧化,而无铅波峰焊较高的焊接温度使得氧化问题更为严重,从而导致熔融钎料表面形成更多的残渣(dross). 在使用Sn-Pb钎料的情况下,向熔融钎料槽中加入适量的抗氧化油可有效抑制钎料氧化问题,

3. dross是什么意思

3. 糟粕：早恋puppy love | 糟粕dross | 噪声治理noise abatement