■ attention 与 caution

一般的醒目告示上，用 attention 的多半后面内容比较长，而且往往是好的消息。用 caution 的则多半是后面内容简短的，而且往往是提醒注意危险，一望而知。

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• Caution, Wet Floor.注意，地面有水。

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