New Yorkers may be slightly more immune to their city's grit and grime - and the occasional skittering rodent - as they slog to their jobs every day.

纽约人也许对自己城市的砂砾和尘垢稍微更有免疫力一些，对每天上班路上偶尔窜过脚边的老鼠也更见怪不怪。

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Grit-blasting usually takes off original texture and detail as well as grime which often, funnily enough, protects the stone underneath.

ECONOMIST: Conservation