an air or new????

It is said that time is people's fiercest emeny because it leaves its mark on us, showing us how we get older and older. Anyway, apart from this sad quality, time is also benefic to us because it makes us forget about unhappy pasts. Moreover, with the passing of years societies change and improvements appear. That is why there is a great difference between our society now and the one seventy years ago, for example. People's mentalities change, too and the standard of living, too.

Consequently, major changes occur in the towns we live, for example. New developments appear, as new shops are built, new buildings take the place of old ones, everything receives an air or new little by little.

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5appearance[singular] if something or someone has an air of confidence, mystery etc, they seem confident, mysterious etc
air of
e.g.
She had an air of quiet confidence.
She looked at him with a determined air.

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