But you can never see a red bear.

但是，你从来没见过一头红色的熊。

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In other words, they probably bear a distant relation to the semiotics of the stoplight, and that's probably why red was chosen for ambulances and police cars: because they put into your head the notion of "stop."

这很可能是源自于,红灯在一些语义中表示停止的意思，它被应用在了救护车和警车上：,因为他们带有警告的意味“

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Coke says it will distribute more than one billion white cans and roughly the same number of seasonal red cans, which also include polar-bear images.

WSJ: A Frosty Reception for Coca-Cola's White Christmas Cans

Among the dead were protected creatures such as a red-crowned crane, four stump-tailed macaques and a brown bear.

FORBES: Tigercide

With the three relevant Federal agencies working together to remove barriers to development on federally owned facilities, hydroelectric developers can be reasonably confident that their investments in planning will eventually bear fruit in new hydropower generation, and not be blocked at the last minute by unexpected red tape.

FORBES: Administration Lays the Groundwork for Hydropower Boom