irreplaceable feature

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Low detection limits are an irreplaceable feature when low concentrations of valuable metals and important alloying elements of metals need to be measured.
So the camp culture from the top to the bottom should be individually and collectively committed to caring for the natural and irreplaceable features of the property, including the land, water (above and below ground), and air.
Finding irreplaceable features important for our future well-being might.
said, "Preserving a piece of history recognizes, saves and enhances the irreplaceable features that give each community its distinctive character.