经硫酸铜溶液侵蚀四次不露铁的翻译：Erosion of copper sulfate solution four exposed iron 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

The erosion of copper sulphate solution does not reveal four iron

Erosion of copper sulfate solution four exposed iron

Corrodes after the sulfuric acid copper solutions four times does not reveal the iron

The copper sulphate solution 4 times erosion exposed iron

Erosion of copper sulfate solution four exposed iron