Automobile manufacturers were well aware that rust occurred in interior recessed areas, also noting that flat exposed areas, such as roofs, were often rust free.
汽车制造厂商们早已注意到汽车内部隐蔽处的锈蚀，但暴露在外的平面部位，如车顶却不易锈蚀。
Steel must be rust free and the work will benefit from a light sand-blast .
钢架不得生锈，这可以通过轻微抛丸处理来达到。
The structure has the advantages of simple and practical use, easy installation and future maintenance, and on-site welding-free property, and rust caused by welding is prevented.
该结构简单实用，易于安装和以后的检修，并且达到现场免焊接的目的，防止由于焊接带来的锈蚀问题。
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