Some anthropologists have suggested that even the earliest shoes may have served a more symbolic than protective function.

一些人类学家曾提出，即使是最早的鞋，也有可能象征意义更多于保护作用。

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Alkaloids are believed to have a protective function for plants because they are toxic to bacteria and herbivores who try to eat the plants.

人们相信生物碱具有保护植物的功能，因为它们对细菌和那些想要吃掉植物的食草动物具有毒性。

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Under these conditions the switchgear equipment is performing a protective function.

在此情况时，开关装置执行的是保护功能。

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He successfully challenged the assertions of "executive privilege" for some White House aides and a "protective function privilege" for the Secret Service.

CNN: Related Stories

It isn't clear what role these receptors play in the body, but scientists suggest they might have a protective function, as they do in the mouth.

WSJ: People Who Taste Too Much