Exposed iron will gradually rust away to powder.

放在露天的铁会逐渐锈成粉末.

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If iron is left exposed to damp air, it will rust away to powder.

如果铁暴露于潮湿空气之下就会慢慢生锈腐蚀成碎末的.

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Unemployment has soared as the hulks of fishing boats rust away on the salt - encrusted seabed.

裸露的海床布满白花花的海盐渍,一艘艘锈迹斑斑的渔船搁浅其中,从而导致失业率急剧上升.

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