包装好的食品不可能受到放射性污染；例如，罐装食品或者塑料包装食品，只要这些食品是密封的，便不会受放射性污染。

Radioactivity cannot contaminate food that is packaged; for example, tinned or plastic-wrapped food is protected from radioactivity as long as the food is sealed.

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如果有人已经接触到水银，要脱下污染的鞋子和衣物，装在两个袋子里，密封好。

Those who may have come into contact with mercury should be directed to remove contaminated shoes or clothing, which should be placed in two bags, sealed and closed.

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该电池为密封的免维护部件，内部装有危害人体健康并可造成环境污染的物质。

These batteries are sealed, maintenance-free components containing substances that are harmful to health and a source of environmental pollution.

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