Both are OK. The plural will not make us think that girls have two faces. Clive
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CliveThe plural will not make us think that girls have two faces.I see. Hmm, perhaps it's against logic to think that they might have two faces, but what about this example?
CliveWhat confusion do you think may arise?It's not really about the meaning itself... I just wanna know whether native speakers use the plural or singular form in these examples.