求翻译：b) constitution of materials or coatings resistant to weather and corrosion, if they are exposed in the environment external or corrosive;是什么意思？

待解决

悬赏分：1 - 离问题结束还有

b) constitution of materials or coatings resistant to weather and corrosion, if they are exposed in the environment external or corrosive;

问题补充：

匿名	2013-05-23 12:21:38

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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